Curious about current emitting loud sound (5)
I believe the answer is:
noisy
'emitting loud sound' is the definition.
(noisy means making loud noises)
'curious about current' is the wordplay.
'curious' becomes 'nosy' (similar in meaning).
'about' is an insertion indicator.
'current' becomes 'I' (symbol for electric current).
'nosy' placed around 'i' is 'NOISY'.
(Other definitions for noisy that I've seen before include "Unpleasantly loud" , "Raucous" , "row" , "Making much sound" , "Disturbingly loud" .)