Crossword Genius

Be on point duty (4,5)

Ross

I believe the answer is:

keep score

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

'be' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how one could define the other.

'point duty' is the wordplay.
I cannot quite understand how this works, but
'point' could be 'core' (core is a kind of point) and 'core' is found in the answer.
The remaining letters 'keeps' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'on' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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