Having dressed, he'd gone after the fool (4)

I believe the answer is:

clot

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'the fool' is the definition.
(I've seen this in other clues)

I can't explain the rest of the clue.

(Other definitions for clot that I've seen before include "Clumsy person" , "A lump in a blood vessel" , "medical problem" , "Fool - congeal" , "Thick lump - thick person" .)

I've seen this clue in the Evening Standard.

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