How plain cakes may be picked up (7)

I believe the answer is:

noticed

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'be picked up' is the definition.
(pick up can mean to spot or notice)

I don't understand the rest of the clue.

(Other definitions for noticed that I've seen before include "remarked" , "Detected" , "Perceived or observed" , "Clocked" , "Spotted" .)

I've seen this clue in The Times.

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