Dirigible (5)
'dirigible' is the definition.
(synonyms)
This is all the clue.
(Other definitions for airship that I've seen before include "flying craft" , "mode of flying" , "Gas-filled craft" , "Lighter-than-air craft" , "Old flier" .)
'dirigible' is the definition.
(blimp is a kind of dirigible)
This is the entire clue.
(Other definitions for blimp that I've seen before include "David Low's cartoon colonel - airship used for publicity" , "full of hot air?" , "returns one pound to provost" , "Large inflatable" , "Small nonrigid airship" .)