Writer glad aeroplane is fixed! (5,5,3)
I believe the answer is:
edgar allan poe
'writer' is the definition.
(I've seen this before)
'glad aeroplane is fixed' is the wordplay.
'is fixed' indicates anagramming the letters.
'glad'+'aeroplane'='gladaeroplane'
'gladaeroplane' with letters rearranged gives 'EDGAR ALLAN POE'.
(Other definitions for edgar allan poe that I've seen before include "Author of The Murders in the Rue Morgue" , "Short-story writer" , "Writer producing horror" , "He wrote" , "US" .)