Free party for peacekeepers? (4)
I believe the answer is:
undo
'free' is the definition.
(as in undoing someone's chains)
'party for peacekeepers?' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'for' says to put letters next to each other (I've seen this in other clues).
'peacekeepers?' becomes 'un'.
'do' after 'un' is 'UNDO'.
(Other definitions for undo that I've seen before include "Ruin prospects of; cancel" , "Remove the wrapping" , "Wreck" , "Unfasten, loosen" , "Spoil" .)