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