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For
this
special
purpose,
stir
round
hot
and
cold
(2,3)
For this special purpose, stir round hot and cold (2,3)
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The definition is at the beginning of the clue.
How the clue works
For this special purpose is the definition. Take ADO (a 'stir') placed round H (hot) to give ADHO, then add C (cold) on the end for AD HOC.