Be warned, this isn't easy, but some some of the definitions are nothing short of genius. Those, coupled with some of the wittiest wordplay I've ever seen, and we have a real gem of a puzzle.
"What happens before weekend begins" and "bedroom item which accompanies one" are just two among many. Then there's the wonderful 7d and 1a, either of which could be a COD, as could 15a.
However, I'm going to go with the deceptively simple 19d "One hears something in the bath, topless" - brilliant!
Thanks to Picaroon for a masterclass in the art of crossword setting:-)