Crossword Genius

Affect, influence (7)

Ross

I believe the answer is:

impinge

(Other definitions for impinge that I've seen before include "Make an impact, or have bearing on" , "Have a (negative) effect (on)" , "Have an effect (upon)" , "Trespass (upon)" , "Encroach (upon)" .)

I've seen this clue in The Guardian.
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