'Innocent' Alice being false — no good inside (7)
I believe the answer is:
angelic
'innocent' is the definition.
(thesaurus)
'alice being false no good inside' is the wordplay.
'being false' is an anagram indicator.
'no' becomes 'n' (common abbreviation).
'good' becomes 'g' (abbreviation).
'inside' is an insertion indicator.
'n'+'g'='ng'
'alice' anagrammed gives 'aelic'.
'aelic' going around 'ng' is 'ANGELIC'.
(Other definitions for angelic that I've seen before include "Seraphic, cherubic" , "Nice gal (anag.)" , "Divine" , "Sweet and well-behaved" , "Of innocent beauty" .)