Tolerant father to draw on New Testament (7)
I believe the answer is:
'tolerant' is the definition.
(associated in meaning)
'father to draw on new testament' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'to draw' becomes 'tie' (synonyms).
'on' is a charade indicator (letters next to each other).
'new testament' becomes 'nt'.
(Other definitions for patient that I've seen before include "Long-suffering - person in hospital" , "Calm" , "Willing to wait" , "One receiving medical care" , "One receives medical care" .)