Some ensure loo cleanliness on the rise in jail (6)
I believe the answer is:
cooler
'jail' is the definition.
(thesaurus)
'some ensure loo cleanliness on the rise' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'on the rise' says the letters should be written in reverse.
'relooc' is hidden in the letters of 'ensure loo cleanliness'.
'relooc' back-to-front is 'COOLER'.
'in' is the link.
(Other definitions for cooler that I've seen before include "less enthusiastic" , "It's not so hot" , "Fan" , "more sophisticated" , "Nick" .)