Plug more suitable for electrical accessory (7)
I believe the answer is:
adapter
'electrical accessory' is the definition.
(adapter is a type of electronic device)
'plug more suitable' is the wordplay.
'plug' becomes 'ad' (as in plugging a product).
'more suitable' becomes 'apter' (more apt).
'ad'+'apter'='ADAPTER'
'for' acts as a link.
(Other definitions for adapter that I've seen before include "Plug attachment" , "I could modify" , "sort of plug" , "'Apt, dear!' (anag.); a switching device" , "Dear Pat (anag)" .)