Key lingo for French food (8)
I believe the answer is:
escargot
'french food' is the definition.
(French snail delicacy)
'key lingo' is the wordplay.
'key' becomes 'esc' ('Escape' key on a computer keyboard).
'lingo' becomes 'argot' (synonyms).
'esc'+'argot'='ESCARGOT'
'for' acts as a link.
(Other definitions for escargot that I've seen before include "Hardly fast food" , "French delicacy" , "mollusc, from Paris" , "Edible snail (from Fr.)" , "national delicacy" .)