Peacekeepers and press wanting right association (5)
I believe the answer is:
union
'association' is the definition.
(I've seen this before)
'peacekeepers and press wanting right' is the wordplay.
'peacekeepers' becomes 'UN' (United Nations, peacekeeping organisation).
'and' means one lot of letters go next to another.
'press' becomes 'iron' (ironing is a kind of pressing).
'wanting' is a deletion indicator (wanting can mean lacking).
'right' becomes 'r' (abbreviation).
'iron' with 'r' taken out is 'ion'.
'un'+'ion'='UNION'
(Other definitions for union that I've seen before include "Merger like marriage" , "Association - guild" , "Coalition" , "Climbing plant" , "Result of joining" .)