Fits current trousers (7)
I believe the answer is:
accords
'fits' is the definition.
(according is a kind of fitting)
'current trousers' is the wordplay.
'current' becomes 'ac' (alternating current).
'trousers' becomes 'cords' (cords is a kind of trousers).
'ac'+'cords'='ACCORDS'
(Other definitions for accords that I've seen before include "Is in harmony" , "Agreements between two states" , "is in agreement" .)