Crossword Genius

Heterosexual couple hiding half of what's put inside cover (7)

Ross

I believe the answer is:

sheathe

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But I can't explain it at all! Could you help me understand?

(Other definitions for sheathe that I've seen before include "Put away (a sword)" , "Put (a sword) into case" , "Put into scabbard" , "Encase in protection" , "stow away safely" .)

I've seen this clue in The Guardian.
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