To recover will require a sort of miracle (7)
I believe the answer is:
reclaim
'to recover' is the definition.
('reclaim' can be a synonym of 'recover')
'a sort of miracle' is the wordplay.
'a sort of' indicates an anagram.
'miracle' is an anagram of 'RECLAIM'.
'will require' is the link.
(Other definitions for reclaim that I've seen before include "civilize" , "'Make useful again, land say (7)'" , "Miracle (anag)" , "Recover (materials/land) for subsequent use" , "Salvage" .)