I gone done another.
As before, all answers are related to comedy. Names of shows, people, concepts, etc. I don't think this is as tricky as the last. Nothing *too* obscure.
Apologies in advance for any mistakes.
ACROSS
2 DVDs have them, full of celebrity cameos. (6)
4 Wedding dress features sketch show. (3, 5)
7 Periodical. Urethral sphincter? (6, 3)
14 Cocaine burn leads to American casualty, a vitriolic critic. (7, 7)
15 A "D" actor moonlighting in Viz? (4, 5)
17 Celebrities, Conservatives, celebrity impressions. (4, 7)
18 Article on Torville & Dean at home? It was a mockumentary. (3, 6)
19 Half a duo sounds like a floating testicle. (5, 4)
20 Chasing Hoover? Scales plays a part. (5, 5)
DOWN
1 Terminal stiffy jokes around on the piano. (8, 4)
2 Light my fire? Cash only in a public house. (5, 5)
3 Ladyboy gas – the only remotely funny thing on ITV1 at the moment. (2, 4)
4 Masked performance. Someone browsing in an archery store? (2, 7)
5 Judging staged comedy tort claims is corrupt. (6, 6)
6 War leader comes from odd rectangle helmet. (7, 8)
8 Crabs bitten horribly by Scottish alcoholic. (3, 1, 7)
9 Fat chick confused by dark tan. (4, 5)
10 Young stand-up to masturbate at the heart of government. (4, 9)
11 Drink with Bono's ex and the last of producers results in C4 comedy drama. (8)
12 Stone root had a breakdown. (6, 6)
13 Radio monologues are anything but gospel. (3, 3, 4)
16 Awful jerk on telephone. Awful jerk on face. (10)
SPOILERS will ensue in the thread.