City in which the three took time off (3)

I believe the answer is:

rio

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'city' is the definition.
(Rio de Janeiro)

I can't explain the remainder of the clue.

(Other definitions for rio that I've seen before include "(Golfer) in the sand" , "Brazilian city and port" , "Location of next Olympic Games, in short" , "Spanish word for river" , "The ... Grande borders Texas and Mexico" .)

I've seen this clue in the Evening Standard.

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