Cypriot city, in short? (3)
'short?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'cypriot city in' is the wordplay.
'in' says the answer is hidden in the clue.
'RIO' is hidden in the letters of 'cypriot city'.
Can you help me to learn more?
(Other definitions for rio that I've seen before include "The ... Grande borders Texas and Mexico", "Spanish word for river", "- Ferdinand, footballer", "place of carnival", "Manchester United player in South American city, in short?".)