Very accurate. That's excellent (4,2)
I believe the answer is:
bang on
'very' is the definition.
Both the answer and definition are adjectives.
Maybe you can see an association between them that I don't see?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bang on that I've seen before include "Informally, absolutely correct - may be noisy" , "Exactly right; talk tediously (about)" , "Absolutely right, just so - in noisy way?" , "Informally and absolutely accurate; it's explosive" , "with great accuracy" .)