Steel OK to fashion new frame (8)
I believe the answer is:
skeleton
'frame' is the definition.
(synonyms)
'steel ok to fashion new' is the wordplay.
'to fashion' indicates an anagram.
'new' becomes 'n' (abbreviation as in New Testament NT).
'steel'+'ok'='steelok'
'steelok' with letters rearranged gives 'skeleto'.
'skeleto'+'n'='SKELETON'
(Other definitions for skeleton that I've seen before include "Not sleek (anag.)" , "With the team depleted" , "Bony framework" , "person in no danger of looking fat!" , "Basic frame" .)