Crossword Genius

Sort of oil Titian turned against (4)

Ross

I believe the answer is:

derv

I'm a little stuck... Click here to teach me more about this clue!

'sort of oil' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'titian turned against' is the wordplay.
'titian' becomes 'red' (Titian can mean a red colour).
'turned' is a reversal indicator.
'against' becomes 'v' (abbreviation for 'versus').
'red' written backwards gives 'der'.
'der'+'v'='DERV'

Can you help me to learn more?

(Other definitions for derv that I've seen before include "Vehicle fuel oil" , "Diesel engine fuel oil" , "Type of fuel" , "Lorry fuel" , "Water monster" .)

I've seen this clue in The Times and The Sunday Times.
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