Concern about interrupting wearing trial (8)
I believe the answer is:
interest
'concern' is the definition.
('interest' can be a synonym of 'concern')
'about interrupting wearing trial' is the wordplay.
'about' becomes 're' (regarding**).
'interrupting' is an insertion indicator.
'wearing' becomes 'in' (wear in (and 'in' is fashionable)).
'trial' becomes 'test' ('test' can be a synonym of 'trial').
'in'+'test'='intest'
're' placed within 'intest' is 'INTEREST'.
(Other definitions for interest that I've seen before include "attention is shown" , "Share - concern" , "Diversion" , "Significance" , "Pursuit" .)