11a Along the lines of (like) - anag 'self-loathing one'
20a Rain cats and dogs
8d Out of commission
1d Prima ballerinas - 'primer' (textbook, covers) 'a ball' + 'in' + 'as' (like)
It's always nice to post the full clue (eg 1d here "...popular like dancers") so that people without the puzzle can more readily help :-)