Crossword Genius

Clash finished? Not quite and few may understand it (6)

Ross

I believe the answer is:

jargon

'few may understand it' is the definition.
(words used by only a select group)

'clash finished? not quite' is the wordplay.
'clash' becomes 'jar' (synonyms).
'finished?' becomes 'gone' (going is a kind of finishing).
'not quite' means to remove the last letter.
'gone' with its last letter removed is 'gon'.
'jar'+'gon'='JARGON'

'and' acts as a link.

(Other definitions for jargon that I've seen before include "Specialised terminology" , "special language" , "Specialised language" , "Professional terminology" , "Language specific to an activity" .)

I've seen this clue in The Guardian.
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