Put in for one stripe, perhaps (9)
I believe the answer is:
interpose
'put in' is the definition.
(synonyms)
'one stripe perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'one'+'stripe'='onestripe'
'onestripe' is an anagram of 'INTERPOSE'.
'for' is the link.
(Other definitions for interpose that I've seen before include "mediate" , "Insert between (one thing and another)" , "step in" , "butt in" , "Place between" .)