This gas in tanks leads to gratitude (8)

I believe the answer is:

hydrogen

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'this gas' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for hydrogen that I've seen before include "bomb-maker" , "Chemical element with atomic no. 1 in the periodic table" , "Kind of bomb" , "With oxygen, it forms water" , "Lightest of all elements" .)

I've seen this clue in the Sydney Morning Herald.

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