Lift sound beams (4)
I believe the answer is:
rays
'beams' is the definition.
(rays of light)
'lift sound' is the wordplay.
'lift' becomes 'raise' (synonyms).
'sound' shows a homophone (sound like).
'raise' is a homophone of 'RAYS'.
(Other definitions for rays that I've seen before include "Single lines of light" , "Flat fish" , "They swim" , "Beams - fish" , "we hope to catch occasionally out of the blue?" .)