Underwear provided for leaders in action? (6)
I believe the answer is:
briefs
This clue is a double definition.
'underwear' is the first definition.
(I've seen this before)
'provided for leaders in action?' is the second definition.
(briefs are given to lawyers leading legal actions)
(Other definitions for briefs that I've seen before include "Underwear and lawyer's documents" , "Barristers' cases or advices" , "by which privates will be constrained" , "Underpants for lawyers?" , "Abstracts" .)