Rabbit? Exactly (4,2)

I believe the answer is:

bang on

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'exactly' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for bang on that I've seen before include "Keep talking tediously" , "Exactly right - sounds noisy" , "Exactly right; talk tediously (about)" , "Absolutely right, just so - in noisy way?" , "Talk too long (informal) - exactly (informal)" .)

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