It's used as anti-freeze in exceedingly cold weather (6)

I believe the answer is:

glycol

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'it's used as anti-freeze' is the definition.
I can't tell whether this defines the answer.

'in exceedingly cold weather' is the wordplay.
'in' indicates the answer is hidden within the clue.
'GLYCOL' can be found hidden inside 'exceedingly cold weather'.

Can you help me to learn more?

(Other definitions for glycol that I've seen before include "Basis of antifreeze" , "Type of compound" .)

I've seen this clue in The Globe and Mail.

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