Crossword Genius

Bubble in black painting (4)

Ross

I believe the answer is:

boil

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

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

'in' acts as a link.

(Other definitions for boil that I've seen before include "Abscess" , "Painful sore" , "become inflamed" , "7 in water" , "Eruption of the skin" .)

I've seen this clue in The Sun.
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