Thanks to Everyman, that was good fun but with a few minor quibbles...
19a - Didn't know that word for "pretentious" even though I had the first 3 letters thanks to the wine being a favourite of mine:-)🍷
10a - Still don't fully understand where the last 5 letters come from and am also puzzled by the definition - I've always associated the answer with being skinny or unhealthily thin but not "inferior", and Chambers seems to agree. No doubt there will be words that are linked to both but I really don't want to get into a whole debate like last week where justification was given for going from "is it" to 'really' to 'say' to "eg" (then why bring it up Bren! 😩)
17a - Thought the surface was ruined by the use of "what".
COD:- A toss-up between 20a and 7d - short and sweet:-)