Crossword Genius

Something binding on record? (4)

Ross

I believe the answer is:

tape

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'record?' is the definition.
(taping is a kind of recording)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tape that I've seen before include "The winning runner breasts the ...." , "Record - broken by the winner" , "Band" , "Race finishing-line" , "Record; finishing line" .)

I've seen this clue in the Evening Standard.
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