Curdle the fool (4)

I believe the answer is:

clot

This clue is a double definition.

'curdle' is the first definition.
('clot' can be a synonym of 'curdle')

'the fool' is the second definition.
(I've seen this before)

(Other definitions for clot that I've seen before include "3 [DUMMY]" , "Twit; blood problem" , "Thick lump - thick person" , "(Of blood) coagulate" , "Clumsy person" .)

I've seen this clue in The Telegraph.

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