Stave off a match (5)
I believe the answer is:
vesta
'a match' is the definition.
(type of historical wooden match)
'stave off' is the wordplay.
'off' indicates an anagram.
'stave' is an anagram of 'VESTA'.
(Other definitions for vesta that I've seen before include "heavenly body" , "Hearth goddess; a match" , "Stave (anag.)" , "Roman goddess; match" , "Roman goddess of the hearth" .)