Treat milk as per suite's order (10)

I believe the answer is:

pasteurise

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'treat milk' is the definition.
The definition suggests a verb in its base form which matches the answer.

'as per suite's order' is the wordplay.
'order' indicates an anagram.
'as'+'per'+'suite'='aspersuite'
'aspersuite' is an anagram of 'PASTEURISE'.

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(Another definition for pasteurise that I've seen is " make milk sterile?".)

I've seen this clue in The Daily Express.

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