Foolishly mixed? (6)

I believe the answer is:

motley

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'mixed?' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

(Other definitions for motley that I've seen before include "A jester's coloured dress - on with it" , "Widespread outbreak of disease" , "Disparate; jester's garb" , "Haphazard assortment of different kinds" , "Multicoloured like old jester's costume" .)

I've seen this clue in the Evening Standard.

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