Student of behaviour got hostile when misbehaving! (10)
I believe the answer is:
ethologist
'student of behaviour' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'got hostile when misbehaving' is the wordplay.
'when misbehaving' is an anagram indicator.
'got'+'hostile'='gothostile'
'gothostile' with letters rearranged gives 'ETHOLOGIST'.
Can you help me to learn more?
(Another definition for ethologist that I've seen is " Desmond Morris, for example".)