Instrument running without current (4)
I believe the answer is:
gong
'instrument' is the definition.
(gong is a kind of instrument)
'running without current' is the wordplay.
I cannot really see how this works, but
'running' could be 'on' (I've seen this in other clues) and 'on' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for gong that I've seen before include "Sound announcing meal" , "Medal; forty down" , "Dinner chime or slangy medal" , "Beat this" , "Percussion instrument - medal (slang)" .)