Crosses houses we'd rebuilt for timber suppliers (8)
I believe the answer is:
redwoods
'timber suppliers' is the definition.
(trees supplying timber)
'crosses houses we'd rebuilt' is the wordplay.
'crosses' becomes 'roods' (I've seen this in another clue).
'houses' is an insertion indicator.
'rebuilt' indicates anagramming the letters.
'wed' is an anagram of 'edw'.
'roods' placed around 'edw' is 'REDWOODS'.
'for' is the link.
(Other definitions for redwoods that I've seen before include "Tall sequoia trees" , "Giant trees" .)