Get back to bring about miracle (7)
I believe the answer is:
reclaim
'get back' is the definition.
(I've seen this before)
'about miracle' is the wordplay.
'about' indicates anagramming the letters.
'miracle' anagrammed gives 'RECLAIM'.
'to bring' acts as a link.
(Other definitions for reclaim that I've seen before include "Recover (materials/land) for subsequent use" , "Win back" , "Get back (eg from the sea)" , "'Make useful again, land say (7)'" , "Salvage" .)