Crossword Genius

Joke with son on board plane (4)

Ross

I believe the answer is:

jest

'joke' is the definition.
('jest' can be a synonym of 'joke')

'son on board plane' is the wordplay.
'son' becomes 's'.
'on board' indicates putting letters inside.
'plane' becomes 'jet' (jet plane is a kind of plane).
's' put into 'jet' is 'JEST'.

'with' is the link.

(Other definitions for jest that I've seen before include "Joke, gag" , "Ridicule" , "Piece of humour" , "fun" , "Quip" .)

I've seen this clue in The Telegraph.
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