See a Harrison Ford film (7)

I believe the answer is:

witness

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'see' is the definition.
(to witness something is to see it happen)

I don't understand how the rest of the clue works.

(Other definitions for witness that I've seen before include "One who saw an event, may give evidence" , "Bystander" , "Observe - evidence" , "See (an event or crime)" , "Evidence, proof" .)

I've seen this clue in the Evening Standard.

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