Instrument with an electric circuit? (5)
I believe the answer is:
cello
'instrument' is the definition.
(cello is a kind of instrument)
'with an electric circuit?' is the wordplay.
'with' says to put letters next to each other.
'an electric' becomes 'cell' (I can't explain this - if you can you should give a lot more credence to this answer).
'circuit?' becomes 'o'.
'cell' put next to 'o' is 'CELLO'.
Can you help me to learn more?
(Other definitions for cello that I've seen before include "Viola's bigger brother?" , "Bass stringed instrument" , "Music-maker" , "Tortelier's instrument" , "Instrument in the violin family" .)