Ray has prepared timber (4)
I believe the answer is:
beam
This could be a double definition.
'ray' is the first definition.
(synonyms)
'prepared timber' is the second definition.
'beam' can be an answer for 'timber' (I have seen 'Sturdy timber ' mean 'beam' so perhaps 'timber' could also mean 'beam'). I'm unsure of the 'prepared' bit.
'has' is the link.
Can you help me to learn more?
(Other definitions for beam that I've seen before include "Apparatus used by women gymnasts" , "Rafter - smile - width" , "Smile broadly or radiate" , "Sturdy timber" , "Column of light" .)