Crossword Genius

Stick up some simpleton (3)

Ross

I believe the answer is:

mug

This clue is a double definition.

'stick up' is the first definition.
(mugging is a kind of sticking up)

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

'some' acts as a link.

(Other definitions for mug that I've seen before include "Drinking vessel for one easily deceived" , "Drinking vessel, by gum" , "Fall guy" , "attack" , "In slang, a person easily deceived" .)

I've seen this clue in the Evening Standard.
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