Crossword Genius

Painting over one line (3)

Ross

I believe the answer is:

oil

'painting' is the definition.
(thesaurus)

'over one line' is the wordplay.
'over' means one lot of letters go next to another.
'one' becomes 'oi' (I can't explain this - if you can you should believe this answer much more).
'line' becomes 'l'.
'oi'+'l' is 'OIL'.

(Other definitions for oil that I've seen before include "Viscous substance for lubrication" , "SECOND PART OF 23" , "Type of fuel" , "eg Olive" , "Lubricate; fuel" .)

I've seen this clue in The Times.
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