Quick Cryptic 641 by Felix

What an excellent QUICK cryptic. It was quick - 7.47 which may be a record but also full of humour. Several stand out - my favourites being 10dn and 21ac.
Thanks for a great start to the day Felix.

ACROSS

1. Radio ham - set operator. Anagram (worked) of HAD MAORI.
5. Boob - error. (B)rought (O)ut (O)ne's (B)riefcase.
8. Board - double definition.
9. Jabbers - double definition.
11. A pig in a poke - risky purchase. Anagram (after repair) of PIPE OK AGAIN.
13. On edge - tense. One (ONE), director general (DG), programm(E).
14. Skater - person moving on ice. Runs (R) after fish (SKATE).
16. Yellowstone - US national park (or/and what is seen in it). Chicken (YELLOW), fourteen pounds (STONE.
18. Riviera - holiday region. Anagram (excited) of I ARRIVE.
19. Froze - stopped dead. Mostly free (FRE) around Australia (OZ).
20. Turk - countryman. Se(T) yo(U) easie(R) tas(K).
21. Attendee - one present. Two hours before noon (AT TEN), by river (DEE).

DOWN

1. Ruby - gemstone. Polish (RUB), (Y)our.
2. Draw a veil over - hide. Anagram (unusually) of REVEAL VIA WORD.
3. Old King Cole. A cryptic definition - in his reign he called, as I remember, for his pipe and his fiddlers 3.
4. Adjoin - come together. (A), radio presenter (DJ), round (O), at home (IN).
6. One for the road - a final drink. Trapped in st(ONE FORT HERO AD)vised.
7. Basketry - the craft of wickerwork. King (K) inside mean (BASE) and attempt (TRY).
10. Black coffee. COD for this cryptic definition. The instant (coffee) one did not turn pale (by adding milk) so it is black.
12. Holy writ - scripture. Anagram (translated) of WORTHILY.
15. Aslant - sloping away. When (AS), left (L), worker (ANT).
17. Cede - to give way. Homophone (we hear) of top player (SEED). Anyone in doubt over which was the definition had 21ac to confirm the final 'E'.