Electronic skill behind film -- it helps one hear better (3-7)
I believe the answer is:
ear trumpet
'it helps one hear better' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'electronic skill behind film' is the wordplay.
'electronic' becomes 'e' (as in e-mail or e-books).
'skill' becomes 'art' (both can mean a talent).
'behind' becomes 'rump' (informal term for the buttocks).
'film' becomes 'ET' (E.T. the Extra-Terrestrial).
'e'+'art'+'rump'+'et'='EAR-TRUMPET'
Can you help me to learn more?
(Other definitions for ear trumpet that I've seen before include "Old hearing aid" , "sound engineering device" , "Early hearing aid" , "Former hearing aid" , "Hearing piece" .)