Cup's mate (6)
I believe the answer is:
saucer
(Other definitions for saucer that I've seen before include "If it's flying, it's a UFO" , "part of the service" , "Cup holder" , "Cup's partner?" , "Piece of crockery, mysterious when flying" .)
I believe the answer is:
saucer
(Other definitions for saucer that I've seen before include "If it's flying, it's a UFO" , "part of the service" , "Cup holder" , "Cup's partner?" , "Piece of crockery, mysterious when flying" .)