Crossword Genius

A number turns it green (7)

Ross

I believe the answer is:

integer

'a number' is the definition.
(I know that integer is a type of real number)

'turns it green' is the wordplay.
'turns' indicates anagramming the letters.
'it'+'green'='itgreen'
'itgreen' with letters rearranged gives 'INTEGER'.

(Other definitions for integer that I've seen before include "Treeing (anag.)" , "rational number remains" , "Result of counting" , "Get Erin (anag)" , "Positive or negative whole number" .)

I've seen this clue in The Mirror.
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