Diesel oil (4)

I believe the answer is:

derv

'diesel oil' is the definition.
(derv is a kind of diesel oil)

This is the entire clue.

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

I've seen this clue in The Sunday Times, The Mirror, The Guardian, the Evening Standard, The Telegraph and The Daily Mail.

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