Crossword Genius

Not conversant with name for a mathematician and physicist (6)

Ross

I believe the answer is:

newton

'a mathematician and physicist' is the definition.
(Isaac Newton)

'not conversant with name' is the wordplay.
'not conversant with' becomes 'newto' (as in a phrase like 'he's new to technology').
'name' becomes 'n' (common abbreviation e.g. on forms).
'newto'+'n'='NEWTON'

'for' is the link.

(Other definitions for newton that I've seen before include "Scientist - unit of force" , "English mathematician and physicist, d. 1727" , "Sir Isaac . . . . . ., great English mathematician" , "SI unit of force" , "Supposedly, an apple fell on his head" .)

I've seen this clue in The Guardian.
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