Include no evil in Seventh Heaven (5,4)
I believe the answer is:
cloud nine
'seventh heaven' is the definition.
(synonyms)
'include no evil' is the wordplay.
'evil' indicates an anagram.
'include'+'no'='includeno'
'includeno' anagrammed gives 'CLOUD-NINE'.
'in' is the link.
(Other definitions for cloud nine that I've seen before include "If you're on this, you're extremely happy" , "On this, one is extremely happy" , "Situation of great elation" , "On which one is blissfully happy" .)