Crossword Genius

Is such fuel a bit undervalued? (6)

Ross

I believe the answer is:

diesel

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for diesel that I've seen before include "Eponymous German engineer" , "Train perhaps" , "Lorry fuel" , "Derv" , "See lid, oddly, of the fuel" .)

I've seen this clue in the Evening Standard.
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