Crossword Genius

Anyone who's seen a Harrison Ford film (7)

Ross

I believe the answer is:

witness

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'film' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

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

Can you help me to learn more?

(Other definitions for witness that I've seen before include "One sees and reports" , "Evidence, proof" , "See (an event or crime)" , "Court testifier" , "Observe - evidence" .)

I've seen this clue in the Evening Standard.
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