Tear down beams, say (4)
I believe the answer is:
raze
'tear down' is the definition.
(synonyms)
'beams say' is the wordplay.
'beams' becomes 'rays' (I've seen this before).
'say' indicates a 'sounds like' (homophone) clue.
'rays' sounds like 'RAZE'.
(Other definitions for raze that I've seen before include "Destroy completely, tear down to the ground" , "Demolish completely" , "Burn to the ground" , "Tear down and make flat with the ground" , "level" .)