Beams in lift, by the sound of it (4)
I believe the answer is:
rays
'beams' is the definition.
(rays of light)
'lift by the sound of it' is the wordplay.
'lift' becomes 'raise' (synonyms).
'by the sound of it' shows a homophone (sound like).
'raise' sounds like 'RAYS'.
'in' acts as a link.
(Other definitions for rays that I've seen before include "Straight lines extending from a point" , "Sunbeams" , "Pencils of light" , "Single lines of light" , "we hope to catch occasionally out of the blue?" .)