Fashionable teams show guts (7)
I believe the answer is:
insides
'guts' is the definition.
(both can mean innards)
'fashionable teams' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'teams' becomes 'sides' (eg football sides).
'in'+'sides'='INSIDES'
'show' is the link.
(Other definitions for insides that I've seen before include "guts" , "Entrails" , "stomach" .)