Current model chasing a French dress (7)
I believe the answer is:
uniform
'dress' is the definition.
(I know that uniform is a type of dress)
'current model chasing a french' is the wordplay.
'current' becomes 'I' (symbol for electric current).
'model' becomes 'form' (both can mean to mould or shape).
'chasing' is a charade indicator (letters next to each other) (some letters chase after others).
'a french' becomes 'un' ('a' in French).
'i'+'form'='iform'
'iform' after 'un' is 'UNIFORM'.
(Other definitions for uniform that I've seen before include "Regular - soldier's dress" , "Military clothes" , "Always the same, unvarying." , "Identifying clothing" , "Unvarying; livery" .)