Crossword Genius

Cambridge mathematician with right approach to resistance (8)

Ross

I believe the answer is:

wrangler

'cambridge mathematician' is the definition.
(term for a mathematician at Cambridge University)

'with right approach to resistance' is the wordplay.
'with' becomes 'w' (abbreviation).
'right' becomes 'r' (common abbreviation).
'approach' becomes 'angle' (as in a journalist's approach to a story).
'to resistance' becomes 'r' (electronics abbreviation).
'w'+'r'+'angle'+'r'='WRANGLER'

(Other definitions for wrangler that I've seen before include "Disputant - Cambridge mathematician" , "One arguing" , "Ranch livestock handler" , "Argumentative person - Cambridge mathematician" , "one is in charge of animals" .)

I've seen this clue in The Guardian.
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