Get cooler, but don’t freeze! (4)

I believe the answer is:

stir

I'm a little stuck... Click here to teach me more about this clue!

'get' is the definition.
(I know that get is a more specific form of the action stir)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stir that I've seen before include "Whisk or rouse" , "Move around - prison" , "Affect emotionally" , "move very slightly, or agitate" , "can > go forth" .)

I've seen this clue in the Evening Standard.

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