Alien gent, terribly awkward (9)
I believe the answer is:
inelegant
'awkward' is the definition.
(I've seen this before)
'alien gent terribly' is the wordplay.
'terribly' indicates anagramming the letters.
'alien'+'gent'='aliengent'
'aliengent' with letters rearranged gives 'INELEGANT'.
(Other definitions for inelegant that I've seen before include "Awkward - graceless" , "Lacking refinement" , "Not stylish or refined" , "poorly dressed" , "Eglantine (anag)" .)