Support fire damaged in arch (8)
I believe the answer is:
befriend
'support' is the definition.
(I've seen this before)
'fire damaged in arch' is the wordplay.
'damaged' is an anagram indicator.
'in' is an insertion indicator.
'arch' becomes 'bend' (arch can mean to bend).
'fire' anagrammed gives 'frie'.
'frie' put within 'bend' is 'BEFRIEND'.
(Other definitions for befriend that I've seen before include "Find beer (anag.)" , "be matey with" , "Become pals with (someone)" , "Become a companion to" , "Act as pal to, help out" .)