Crossword Genius

Catch turns up a whole number (3)

Ross

I believe the answer is:

ten

'a whole number' is the definition.
(ten is a kind of whole number)

'catch turns up' is the wordplay.
'catch' becomes 'net' (netting is a kind of catching).
'turns up' shows that the letters should be reversed in order.
'net' written backwards gives 'TEN'.

(Other definitions for ten that I've seen before include "Half a score" , "Very young" , "X-WORD" , "No of sides of a decagon" , "Base of decimal system" .)

I've seen this clue in the Evening Standard.
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