Like a sap, tease (4)

I believe the answer is:

twit

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'tease' is the definition.
(I know that tease can be written as twit)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for twit that I've seen before include "Taunt; fool" , "Silly fool" , "Nincompoop" , "Idiot; tease" , "Silly person (colloq.)" .)

I've seen this clue in the Evening Standard.

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