Lovattts holiday no 79 crack the cryptic

HI, just hoping its not too late to get some help to finish this puzzle.
31a acceptance of policy is a commercial alternative (8) a?opti??
35a ways to quietly change hats (5) p?t??
72a drawers full of creative ideas (7) ??t?s?
27d blows up in explosive final set (8)
Any help would be greatly appreciated.
Have a nice day
Thanx Carole