Strikers on team? Not likely! (7)
I believe the answer is:
outside
'not likely' is the definition.
(as in an outside chance)
'strikers on team?' is the wordplay.
'strikers on' becomes 'out' (I am not sure about this - if you are sure you should believe this answer much more).
'team?' becomes 'side' (both can mean a sports team).
'out'+'side'='OUTSIDE'
(Other definitions for outside that I've seen before include "Al fresco" , "Without" , "having emerged from the tunnel?" , "Alfresco" , "Where smokers now often must go" .)