Only biter gets teeth kicked in outside: exactly what's required (4,3,6)
I believe the answer is:
just the ticket
'biter gets teeth kicked in outside exactly what's required' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'only' is the wordplay.
I cannot really see how this works, but
'only' could be 'just' (synonyms) and 'just' is found within the answer.
The remaining letters 'theticket' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for just the ticket that I've seen before include "Exactly what's needed" , "Perfect!" , "first class?" , "Minimum requirement for one travelling" , "Appropriate or desirable thing" .)