Jets may use this fuel (3)

I believe the answer is:

gas

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'this fuel' is the definition.
(gas is a fuel)

I don't understand the remainder of the clue.

(Other definitions for gas that I've seen before include "Eg, oxygen" , "Substance like air" , "What's needed to drive" , "Hydrogen, for example" , "Hydrogen or oxygen, say" .)

I've seen this clue in The Globe and Mail.

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