Walk like a supporter (5)
I believe the answer is:
strut
This clue is a double definition.
'walk' is the first definition.
(I know that strut is a kind of the walk)
'supporter' is the second definition.
(I've seen this before)
'like a' acts as a link.
(Other definitions for strut that I've seen before include "Reinforcing rod" , "Walk with a lofty proud gait" , "Prop; prance" , "Supporting bar" , "Walk proudly, swagger" .)