Path is covered in beer (5)
I believe the answer is:
aisle
'path' is the definition.
(I've seen this in another clue)
'is covered in beer' is the wordplay.
'covered in' indicates putting letters inside.
'beer' becomes 'ale' (type of beer).
'is' inserted into 'ale' is 'AISLE'.
(Other definitions for aisle that I've seen before include "Way between seating areas" , "Division of the nave in church" , "Passages between seating areas" , "Passageway in theatre" , "Supermarket section" .)