A piece of crockery may be flying (6)
I believe the answer is:
saucer
This clue is a double definition.
'a piece of crockery' is the first definition.
(saucer is a type of crockery item)
'may be flying' is the second definition.
(flying saucer)
(Other definitions for saucer that I've seen before include "Part of a tea set" , "flying, perhaps?" , "It may be flying or on the table" , "See 1" , "part of the service" .)