Crossword Genius

See foolish nationalist replacing liberal (7)

Ross

I believe the answer is:

witness

'see' is the definition.
('witness' can be a synonym of 'see')

I cannot understand how the rest of the clue works.

(Other definitions for witness that I've seen before include "Testimony - see" , "Bystander" , "Onlooker" , "One giving evidence" , "Evidence, proof" .)

I've seen this clue in The Independent.
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