Hunt gathering stand back, showing discipline (8)
I believe the answer is:
chastise
'discipline' is the definition.
(I've seen this before)
'hunt gathering stand back' is the wordplay.
'hunt' becomes 'chase' (I've seen this in another clue).
'gathering' is an insertion indicator (gather can mean to acquire or bring in).
'stand back' becomes 'tis' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'chase' going around 'tis' is 'CHASTISE'.
'showing' is the link.
Can you help me to learn more?
(Other definitions for chastise that I've seen before include "Whip perhaps" , "Beat" , "Severely reprimand" , "Castigate or punish" , "Teach Sis to scold" .)