Reporter’s aircraft not much to look at (5)
I believe the answer is:
plain
'not much to look at' is the definition.
(both can mean dull or unattractive)
'reporter's aircraft' is the wordplay.
'reporter's' indicates a 'sounds like' (homophone) clue (report can mean to speak something aloud).
'aircraft' becomes 'plane' (plane is a kind of aircraft).
'plane' is a homophone of 'PLAIN'.
(Other definitions for plain that I've seen before include "no oil painting features" , "lacking special beauty" , "Undecorated; clear" , "Evident; not fancy" , "Unprepossessing" .)