Crossword Genius

Charge that constitutes a round sum?

Ross

I think it could be either:

Which length description are you looking for?:

5,3

8*

greenfee

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'constitutes a round sum?' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'charge' is the wordplay.
I cannot really see how this works, but
'charge' could be 'fee' (fee is a kind of charge) and 'fee' is found in the answer.
The remaining letters 'green' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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