Installs, as a carpet (4)
I believe the answer is:
lays
'installs as a carpet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lays that I've seen before include "Places (bets?)" , "Puts down; songs" , "Puts down the old ballads" , "Old narrative songs or poems" , "Minstrel's melodies" .)