Pea dart makes a device which may be used in connecting electrical equipment (7)
I believe the answer is:
adapter
'a device which may be used in connecting electrical equipment' is the definition.
'adapter' can be an answer for 'a device' (adapter is a kind of device). I'm not certain of the rest of the definition.
'pea dart makes' is the wordplay.
'makes' indicates anagramming the letters.
'pea'+'dart'='peadart'
'peadart' anagrammed gives 'ADAPTER'.
Can you help me to learn more?
(Other definitions for adapter that I've seen before include "Dear Pat (anag)" , "sort of plug" , "'Apt, dear!' (anag.); a switching device" , "I could modify" , "Plug device" .)