Unstable, throwing such a fit? (6)

I believe the answer is:

wobbly

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'unstable' is the definition.
(similar in meaning)

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

(Other definitions for wobbly that I've seen before include "one may be thrown in temper" , "Unstable - it may be thrown!" , "Unstable - tantrum" , "Rickety" , "Swaying unsteadily" .)

I've seen this clue in The Times.

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