Fashionable team gets locked up (6)
I believe the answer is:
inside
'locked up' is the definition.
(I've seen this before)
'fashionable team' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'team' becomes 'side' (both can mean a sports team).
'in'+'side'='INSIDE'
'gets' acts as a link.
(Other definitions for inside that I've seen before include "Stomach etc - in prison?" , "Indoors" , "Inner surface" , "Internal" , "undercover" .)