It’s awkward being left in Calais (6)
I believe the answer is:
gauche
I believe this clue is a double definition.
'it's awkward' is the first definition.
(I've seen this before)
'left in calais' is the second definition.
('left' in French eg in Calais)
'being' is the link.
(Other definitions for gauche that I've seen before include "Unsophisticated and socially awkward" , "Awkward in manner, tactless" , "Lacking ease of manner (from the French)" , "left for Paris" , "Socially awkward or tactless" .)