Abe's assassin in cubicle (5)

I believe the answer is:

booth

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'cubicle' is the definition.
(synonyms)

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

(Other definitions for booth that I've seen before include "Temporary structure eg for voting" , "Space for voting, phoning, etc" , "Market stall - Lincoln's assassin" , "Telephone housing" , "Temporary shelter" .)

I've seen this clue in The Sun.

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