Crossword Genius

Do better at baseball, say? (3)

Ross

I believe the answer is:

cap

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

'do better' is the definition.
'cap' can be an answer for 'better' (both can mean to beat somebody else's attempt). I am not sure about the 'do' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for cap that I've seen before include "Beat; upper limit" , "One on head; excel" , "Limit (prices)" , "Surpass with headwear" , "Protective lid" .)

I've seen this clue in the Evening Standard.
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