Crossword Genius

What a neat mathematical problem is worth? (4,3)


I believe the answer is:

tidy sum

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'worth?' is the definition.
The answer and definition can be both quantities as well as being singular nouns.
Maybe there's an association between them I don't understand?

'what a neat mathematical problem' is the wordplay.
'what a neat' becomes 'tidy' (synonyms).
'mathematical problem' becomes 'sum' (I've seen this before).
'tidy'+'sum'='TIDY SUM'

'is' is the link.

Can you help me to learn more?

(Other definitions for tidy sum that I've seen before include "A lot of money" , "Considerable amount" .)

I've seen this clue in the Evening Standard.
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