Disciplining after biting retired model (10)
I believe the answer is:
chastising
'disciplining' is the definition.
(to chastise is to punish or discipline)
'after biting retired model' is the wordplay.
'after' becomes 'chasing' (someone after something is chasing or pursuing it).
'biting' is an insertion indicator (I've seen this in other clues).
'retired' is a reversal indicator.
'model' becomes 'sit' (e.g. for a painting).
'sit' back-to-front is 'tis'.
'chasing' going around 'tis' is 'CHASTISING'.
(Another definition for chastising that I've seen is " reprimanding".)