Crossword Genius

Bubble in black paint (4)

Ross

I believe the answer is:

boil

'bubble' is the definition.
(boiling water will bubble)

'black paint' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'paint' becomes 'oil' (oil paint is a kind of paint).
'b'+'oil'='BOIL'

'in' is the link.

(Other definitions for boil that I've seen before include "Cook, swelling" , "Eruption of the skin" , "Painful sore" , "Cook in hot water" , "Sore with a hard core filled with pus" .)

I've seen this clue in The Sun.
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