Key language a bit of a mouthful? (8)
I believe the answer is:
escargot
'a bit of a mouthful?' is the definition.
I can't tell whether this defines the answer.
'key language' is the wordplay.
'key' becomes 'esc' ('Escape' key on a computer keyboard).
'language' becomes 'argot' (argot can mean jargon or slang).
'esc'+'argot'='ESCARGOT'
Can you help me to learn more?
(Other definitions for escargot that I've seen before include "French delicacy" , "Edible snail (from Fr.)" , "A dish of cooked land snails" , "One continually moving house" , "slow food?" .)