Seat request (5)
I believe the answer is:
aisle
'seat request' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aisle that I've seen before include "Passage between rows of seats" , "'Passage, gangway (5)'" , "Passage between shelves in supermarket" , "Path between seats in church" , "Supermarket passageway" .)