Tree rat prepared to move back (7)
I believe the answer is:
retreat
'to move back' is the definition.
(synonyms)
'tree rat prepared' is the wordplay.
'prepared' indicates anagramming the letters.
'tree'+'rat'='treerat'
'treerat' is an anagram of 'RETREAT'.
(Other definitions for retreat that I've seen before include "care home" , "hermitage, perhaps" , "Withdraw from battle" , "Give ground" , "secluded place" .)