Stuck on 44 across: One to ridicule part-time-peace-preserver (volunteer) 7 letters. I have S?O?F?R so could be spoofer or scoffer but can't see which or why?
scoffer
One to ridicule=scoffer (someone who scoffs at - or ridicules - another's efforts)
Part-time peace preserver=S.C. (Special Constable)
Volunteer=(verb) to offer.
Thus: S.C. + offer = scoffer.