Crossword Genius

Trick with needle to get swelling out (6)

Ross

I believe the answer is:

convex

'swelling out' is the definition.
(convex means curving outwards)

'trick with needle' is the wordplay.
'trick' becomes 'con' (a con is a fraud or trick).
'with' means one lot of letters go next to another.
'needle' becomes 'vex' (both can mean to annoy).
'con'+'vex'='CONVEX'

'to get' acts as a link.

(Other definitions for convex that I've seen before include "Curved like surface of a ball" , "Curved outwards" , "Curving outwards" , "Curving like surface of ball" , "Rounded on the outside" .)

I've seen this clue in The Times.
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