Contend with immoral behaviour, shunning clubs (3)
I believe the answer is:
vie
'contend' is the definition.
(synonyms)
'immoral behaviour shunning clubs' is the wordplay.
'immoral behaviour' becomes 'vice' (I've seen this before).
'shunning' indicates named letters should be taken away.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'vice' with 'c' taken out is 'VIE'.
'with' acts as a link.
(Other definitions for vie that I've seen before include "Strive in French way?" , "Compete for something" , "contest" , "Try to do better than" , "Jockey" .)