Yank is fool (4)

I believe the answer is:

jerk

I believe this clue is a double definition.

'yank' is the first definition.
('jerk' can be a synonym of 'yank')

'is fool' is the second definition.
(thesaurus)

(Other definitions for jerk that I've seen before include "contemptibly foolish person" , "dull person" , "fool" , "Abrupt movement" , "Pull suddenly - twerp!" .)

I've seen this clue in The Times.

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