Prefix with sexual (5)

I think it could be either:

Which length description are you looking for?:

metro

'prefix with sexual' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for metro that I've seen before include "Parisian underground system" , "The underground railway system in Paris" , "French underground" , "The Paris Underground transport system" , "what moves many Parisians" .)

I've seen this clue in The New York Times.

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