Crossword Genius

Exactly, son's trapped rabbits (5,2)

Ross

I believe the answer is:

bangs on

I'm a little stuck... Click here to teach me more about this clue!

'rabbits' is the definition.
(talks incessantly)

'exactly son's trapped' is the wordplay.
I cannot really understand how this works, but
'son's' could be 's' and 's' is found in the answer.
'exactly' could be 'bangon' (as a response to a true statement) and 'bangon' is present in the leftover letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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