Free facilities, free at last (5)
I believe the answer is:
loose
'free' is the definition.
(I know that free can be written as loose)
'facilities free at last' is the wordplay.
'facilities' becomes 'loos' (loo is a kind of facility).
'at last' suggests the final letters.
The final letter of 'free' is 'e'.
'loos'+'e'='LOOSE'
(Other definitions for loose that I've seen before include "Slack or immoral" , "Freed" , "Not firmly fixed" , "Not fixed; inexact" , "Liberal" .)