Small airship (5)
I believe the answer is:
blimp
'small airship' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for blimp that I've seen before include "Small nonrigid airship" , "Elderly pompous reactionary person" , "Airship - barrage balloon" , "full of hot air?" , "David Low's cartoon colonel - airship used for publicity" .)