Fashionable team deserted by a footballer (6,4)
I believe the answer is:
inside left
'a footballer' is the definition.
(I've seen this before)
'fashionable team deserted' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'team' becomes 'side' (both can mean a sports team).
'deserted' becomes 'left' (I've seen this in another clue).
'in'+'side'+'left'='INSIDE LEFT'
'by' is the link.
(Other definitions for inside left that I've seen before include "Forward" , "Soccer player from" , "Footballer" .)