It serves a confusing purpose (5)

I believe the answer is:

mixer

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'it serves a confusing purpose' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for mixer that I've seen before include "Eg, tonic water" , "Device for cement or in kitchen" , "Socialiser" , "Food processor" , "Drink to combine with alcohol" .)

I've seen this clue in the Evening Standard.

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