Win back with miracle-working (7)
I believe the answer is:
reclaim
'win back' is the definition.
(I've seen this before)
'miracle-working' is the wordplay.
'working' indicates an anagram.
'miracle' is an anagram of 'RECLAIM'.
'with' is the link.
(Other definitions for reclaim that I've seen before include "Retrieve, recover" , "Win back" , "I'm Clare (anag)" , "Make (land) available for use" , "From sea, rescue" .)