Supermarket division is cutting beer (5)
I believe the answer is:
aisle
'supermarket division' is the definition.
(I've seen this in another clue)
'is cutting beer' is the wordplay.
'cutting' means one lot of letters goes inside another (some letters cut their way into a word).
'beer' becomes 'ale' (type of beer).
'is' placed into 'ale' is 'AISLE'.
(Other definitions for aisle that I've seen before include "Church walkway" , "Extension of the nave in a church" , "The way to get married in church?" , "'Passage, gangway (5)'" , "Walkway between seats" .)