Left in Calais, unable to communicate successfully? (6)

I believe the answer is:

gauche

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'left in calais' is the definition.
('left' in French eg in Calais)

I don't understand how the rest of the clue works.

(Other definitions for gauche that I've seen before include "Graceless" , "not right for Parisian" , "Awkward - ill-bred" , "Awkward in manner, tactless" , "Ill-at-ease, awkward in social situations" .)

I've seen this clue in The Times.

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