Crossword Genius

Clue I'd set for old mathematician (6)

Ross

I believe the answer is:

euclid

'old mathematician' is the definition.
(ancient Greek mathematician)

'clue i'd set' is the wordplay.
'set' is an anagram indicator (instruction to set the letters).
'clue'+'id'='clueid'
'clueid' anagrammed gives 'EUCLID'.

'for' is the link.

(Other definitions for euclid that I've seen before include "Greek philosopher" , "Geometrician of the 3rd century BC" , "mathematician appears" , "Great Greek mathematician, notable for geometry" , "Greek mathematician, 3rd century BC" .)

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