New Lib member in airship (5)
I believe the answer is:
blimp
'airship' is the definition.
(blimp is a kind of airship)
'new lib member' is the wordplay.
'new' indicates anagramming the letters.
'member' becomes 'MP' (Member of Parliament).
'lib' with letters rearranged gives 'bli'.
'bli'+'mp'='BLIMP'
'in' acts as a link.
(Other definitions for blimp that I've seen before include "Small barrage balloon" , "returns one pound to provost" , "aircraft" , "Small nonrigid airship" , "Airship - barrage balloon" .)