Crossword Genius

Shows impatience when aces are attending part (6,2,3,3)

Ross

I believe the answer is:

champs at the bit

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

'shows impatience' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'when aces are attending part' is the wordplay.
I cannot quite see how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
'are' could be 'sat' (sitting is a kind of being) and 'sat' is located in the answer.
'part' could be 'bit' (both mean a piece of something) and 'bit' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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