Crossword Genius

Invent a top missing from videotapes (6)

Ross

I believe the answer is:

devise

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'invent' is the definition.
('devise' can be a synonym of 'invent')

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

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(Other definitions for devise that I've seen before include "Formulate or plan" , "Contrive" , "Make (a plan)" , "Formulate or invent" , "Come up with, a plan perhaps" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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