Very understanding chap, changing with time (8)
I believe the answer is:
empathic
'very understanding' is the definition.
'chap changing with time' is the wordplay.
'changing with' indicates anagramming the letters.
'chap' mixed up with 'time' gives 'EMPATHIC'.
(Other definitions for empathic that I've seen before include "Showing understanding and entering into another's feelings" , "Understanding others' feelings" , "Emotionally sensitive" , "Sensitive to the experiences of others" , "compassionately involved" .)