Crossword Genius

Product based on e.g. a film or series (3-2)

Ross

I believe the answer is:

tie-in

(Other definitions for tie-in that I've seen before include "Something linked to another item or event" , "Book, etc, linked to film, TV show" , "Relationship" , "Make a link (with)" , "commercial extra" .)

I've seen this clue in The Guardian.
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