Great bargain avoids a row (5)
I believe the answer is:
aisle
'a row' is the definition.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for aisle that I've seen before include "Walkway between seats" , "The way to get married in church?" , "lateral strip" , "Part of supermarket" , "A key" .)