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Part of a skin care routine (5)

Ross

I think it could be either:

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5

8

'part of a skin care routine' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for serum that I've seen before include "Antidote" , "Amber-coloured fluid in the blood" , "Antitoxin derived from blood" , "Watery part of blood" , "Blood component containing antibodies, used in immunisation" .)

I've seen this clue in the USA Today.
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