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Great heat and light rain making month squally at first (6)

Ross

I believe the answer is:

sizzle

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'great heat' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for sizzle that I've seen before include "Sound of frying sausages" , "Make a hissing sound while frying" , "Frying hiss" , "Fizz in the pan" , "Fry" .)

I've seen this clue in The Telegraph.
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