Passageways between seats (6)
I believe the answer is:
aisles
'passageways between seats' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for aisles that I've seen before include "Passages between rows of seats" , "Pathways in a church (6)" , "Spaces between seats" , "Church corridors for lassie" , "Passageways between seats" .)