Loosen ties with peace keepers and party (4)
I believe the answer is:
undo
'loosen ties' is the definition.
(undo ties or ropes)
'peace keepers and party' is the wordplay.
'peace keepers' becomes 'un' (I've seen this in other clues).
'and' says to put letters next to each other.
'party' becomes 'do' (do is a kind of party).
'un'+'do'='UNDO'
'with' is the link.
(Other definitions for undo that I've seen before include "Destroy - nullify" , "Open, a knot say" , "Dissolve - ruin" , "Unfasten, loosen" , "Free from ties, laces, etc" .)