Crossword Genius

Jack finds one to be a sneer (4)

Ross

I believe the answer is:

jibe

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'a sneer' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'jack finds one to be' is the wordplay.
'jack' becomes 'j' (playing card abbreviation).
'finds' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'j'+'i'+'be'='JIBE'

Can you help me to learn more?

(Other definitions for jibe that I've seen before include "Barb" , "Mock; jeer" , "Mocking remark" , "Scoff" , "provocation" .)

I've seen this clue in The Mirror.
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