Crossword Genius

Charge that constitutes a round sum? (5,3)

Ross

I think it could be either:

Which length description are you looking for?:

5,3

8*

green fee

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'constitutes a round sum?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

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

'that' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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