Installs, as carpeting (4)
I believe the answer is:
lays
'installs as carpeting' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lays that I've seen before include "Produces eggs" , "literary works?" , "Minstrel's melodies" , "How Pertelote produces" , "Puts down the old ballads" .)