Stall the couple who have nothing (5)
I believe the answer is:
booth
'stall' is the definition.
('booth' can be a synonym of 'stall')
'the couple who have nothing' is the wordplay.
'the couple who' becomes 'both' (I am not sure about this - if you are sure you should believe this answer much more).
'have' means one lot of letters goes inside another.
'nothing' becomes 'o' (looks like zero - 0).
'both' placed around 'o' is 'BOOTH'.
Can you help me to learn more?
(Other definitions for booth that I've seen before include "compartment for voting" , "Telephone housing" , "Market stall - Lincoln's assassin" , "Kiosk" , "assassin in dramatic situation" .)