Lift up the beams, say (5)
I believe the answer is:
raise
'lift up' is the definition.
(raise can mean to lift up)
'beams say' is the wordplay.
'beams' becomes 'rays' (rays of light).
'say' indicates a 'sounds like' (homophone) clue.
'rays' sounds like 'RAISE'.
'the' acts as a link.
(Other definitions for raise that I've seen before include "Lift - increase" , "Bring up, rear" , "climb" , "Uplift" , "Make greater" .)