Finish old women's gift (5)
I believe the answer is:
endow
'gift' is the definition.
(I know that gift can be written as endow)
'finish old women's' is the wordplay.
'finish' becomes 'end' (synonyms).
'old' becomes 'o' (abbreviation as in OT - Old Testament).
'women' becomes 'w' (standard abbreviation).
'end'+'o'+'w'='ENDOW'
(Other definitions for endow that I've seen before include "Pay to found" , "Give funding to establish (something)" , "Woden (anag.)" , "Provide (with financial support, qualities etc)" , "Set up with money" .)