Crossword Genius

Cryptic clue I had for mathematician (6)

Ross

I believe the answer is:

euclid

'for mathematician' is the definition.
(Euclid is an example)

'cryptic clue i had' is the wordplay.
'cryptic' indicates an anagram (a cryptic or obscure order of the letters).
'i had' becomes 'i'd' (I'd).
'clue' anagrammed gives 'eucl'.
'eucl'+'id'='EUCLID'

(Other definitions for euclid that I've seen before include "Book of geometry" , "Alexandrian mathematician" , "mathematician appears" , "6 mathematician" , "Ancient Greek mathematician" .)

I've seen this clue in The Guardian.
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