Crossword Genius

Some undervalued fuel (4)

Ross

I believe the answer is:

derv

'fuel' is the definition.
(I know that derv is a type of diesel fuel)

'some undervalued' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'DERV' can be found hidden inside 'undervalued'.

(Other definitions for derv that I've seen before include "Vehicle diesel-oil" , "Type of fuel" , "Diesel engine fuel oil" , "Vehicle fuel oil" , "Fuel for lorries" .)

I've seen this clue in The Irish Independent.
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