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Throw in the gear, it's warming up again (9)

Ross

I believe the answer is:

reheating

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

'warming up again' is the definition.
I can't judge whether this defines the answer.

'throw in the gear' is the wordplay.
'throw' is an anagram indicator.
'in'+'the'+'gear'='inthegear'
'inthegear' anagrammed gives 'REHEATING'.

'it's' is the link.

Can you help me to learn more?

(Another definition for reheating that I've seen is " Perhaps preparing leftovers".)

I've seen this clue in the Sydney Morning Herald.
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