Team on the flank (4)
I believe the answer is:
side
This clue is a double definition.
'team' is the first definition.
(both can mean a sports team)
'the flank' is the second definition.
(I've seen this in another clue)
'on' acts as a link.
(Other definitions for side that I've seen before include "Ides (anag.)" , "camp" , "Neighbourhood" , "Football team" , "Aspect, sports team" .)