Certain care is lousy for jail (11)
I believe the answer is:
incarcerate
'jail' is the definition.
(synonyms)
'certain care is lousy' is the wordplay.
'is lousy' is an anagram indicator.
'certain'+'care'='certaincare'
'certaincare' is an anagram of 'INCARCERATE'.
'for' acts as a link.
(Other definitions for incarcerate that I've seen before include "Put in prison" , "Imprison" , "Detain" , "Lock up" , "Put behind bars" .)