Mephisto 2737 - Tim Moorey

I found this to be one of the more tricky offerings from the Mephisto series lately. Put a couple of incorrect answers in early (11 across went through several iterations). I didn't think 3 (another clue where I went through several plausible looking answers only to see them fall foul of checking letters) was going to be in Chambers, but it's in the most recent edition. I found it online first.

27 made me smile, though I think any clue with a reference to Hegel is going to tickle me.

Random musing - I've been reading "The Disappearing Spoon" by Sam Kean (it's a rollicking read, though many of the stories don't hold up to scrutiny of secondary literature). He talks about Gilbert N. Lewis living out his final days in his lab as a recluse, railing against the world and complaining about critics of his theories. Wonder if he did crosswords? Or stand-up. Or wrote blogs...

Across
1	ASTONE: LAST(final) ONE(unit) missing the L
5	AU,BADE
9	SKATING RINK: anagram of GRANIT(a) in SKINK (which I knew as a lizard, not a Scots drink)
11	ODMOETRY: O(ring),DO(party),ME(yours truly),TRY(go)
12	PASH,M: haven't heard PASH for feeling since primary school
13	RADIAL: RAC (Royal Atomobile Club, which is far more swanky than I thought), without the C(canine, think dental chart) then DIAL(face)
14	INTIMA: anagram of TIMPANI without P
17	PANTA RHEI: very nice clue - PAN(criticize), TAR(rating - sailor), HEI(r)
18	SHOWPLACE: S, HOW(hill) and then A(one) leaving PALACE. If you're a regular daily crossword fan checking out the Mephisto, it's OK to use one for A
22	MIGNON: anagram of MOANING without A
23	GROG-UP: G in GROUP
24	WAEFU: AE,F in W,U
26	NEMATODA: A DON surrounding TAME, all reversed
27	HEGEMONICAL: MONICA in HEGEL
28	AURORA: OR in AURA
29	UNMIRY: anagram of MINI-RUGBY without 1,G,B
Down
1	AS,A,P
2	SKEAN-DHU: my first in (KHAN,USED)*
3	OTCHIPWE: (TWO)*,E surrounding CHIP(tease)
4	END MAN: ND(no date) in NAME reversed
5	AGO,ROT
6	(b)URMAN
7	ANTIPHONER: or ANTI PHONER(which would be anyone who owns an I"phone")
8	EPYLLION: anagram of P(add)Y,O'NEILL
10	(g)ASTRONOMER: Dorado being a constellation
14	INSIGNIA: anagram of (m)INI (c)ASING
15	GR(king),EG(say),A,TIM(e)
16	MEN-OF-WAR: RAW ONE M all reversed containing F
19	LIPOMA: MOP(grimace) in AIL all reversed
20	AMADOU: hidden
21	LUTER: remove the H from Martin LUTHER
25	UGLY: SNUGLY without SN, and a use I wasn't familiar of for that work to finish