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Is capable of fiery outbursts knocking back most of the garlic, cutting the head in a frenzy (8)

Ross

I believe the answer is:

volcanic

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'head in a frenzy' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?

I cannot understand how the remainder of the clue works.

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(Other definitions for volcanic that I've seen before include "Relating to mountains such as Vesuvius" , "Explosively unstable, rock say" , "Like lava, perhaps" , "given to sudden outbursts" , "Relating to eruption in earth's surface" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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