Goats sporadically skipped to yak (3)

I believe the answer is:

gas

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'to yak' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for gas that I've seen before include "Oxygen is one" , "could be embarrassing for American" , "chew the fat" , "natural resource" , "Idle chat" .)

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

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