Supermarket walkways (6)
I believe the answer is:
aisles
'supermarket walkways' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aisles that I've seen before include "Spaces between seats" , "Paths in church for lassie" , "Passages between rows of seats" , "Lassie in church pathways" , "parts of the church" .)