Bride's walkway (5)
I believe the answer is:
'bride's walkway' 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 "Passageway between seating areas" , "Corridor" , "Way between seat blocks" , "Here comes the bride" , "'Passage, gangway (5)'" .)