Any assistance with a couple of clues would be much appreciated.
7dn: Fly by night (evil doer?) (4) I thought RORT
Also 27ac: Sure about a s-semi 3? (4) USER or TSAR perhaps?
I'm also stuck on 7D. The clue offers an anagram of DOER and 9A could end in either an R or a D. The first half of the clue for 9A leans towards a D but the second half towards an R. In 7D, I can't see any connection to "fly by night" with either RODE or REDO.