Stops in section of the theatre (6)
I believe the answer is:
stalls
This clue is a double definition.
'stops' is the first definition.
(stalling is a kind of stopping)
'section of the theatre' is the second definition.
(ground floor seats in a theatre)
'in' is the link.
(Other definitions for stalls that I've seen before include "Ground floor seats in theatre" , "Market stands for the sale of goods" , "Compartments in stables or theatres" , "pews" , "One section of a theatre" .)