Like the sound of Serpent in a childish tantrum? (5)

I believe the answer is:

hissy

I believe this clue is a double definition.

'like the sound of serpent' is the first definition.
(a snake makes a hissing sound)

'a childish tantrum?' is the second definition.
(a hissy fit is a tantrum)

'in' is the link.

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