Unreliable method to draw back (7)
I believe the answer is:
wayward
'unreliable' is the definition.
(thesaurus)
'method to draw back' is the wordplay.
'method' becomes 'way' (way of doing something).
'to' says to put letters next to each other.
'back' is a reversal indicator.
'draw' in reverse letter order is 'ward'.
'way'+'ward'='WAYWARD'
(Other definitions for wayward that I've seen before include "Capricious and undisciplined" , "Self-willed, unpredictable" , "Unpredictable, wilful" , "Awry" , "Resistant to discipline" .)