Free toilets on end of promenade (5)
I believe the answer is:
loose
'free' is the definition.
('loose' can be similar in meaning to 'free')
'toilets on end of promenade' is the wordplay.
'toilets' becomes 'loos' (loo is a kind of toilet).
'on' means one lot of letters go next to another.
'end of' says to take the final letters.
The last letter of 'promenade' is 'e'.
'loos'+'e'='LOOSE'
(Other definitions for loose that I've seen before include "Not fitting tightly" , "Not tight" , "Promiscuous" , "Baggy" , "Not strict" .)