Low Latin framed by a fool illuminated (7)
I believe the answer is:
moonlit
'illuminated' is the definition.
(I've seen this before)
'low latin framed by a fool' is the wordplay.
'low' becomes 'moo' (both can mean to make a cow noise).
'latin' becomes 'l'.
'framed by' is an insertion indicator.
'a fool' becomes 'nit' (both can mean a stupid person).
'l' going into 'nit' is 'nlit'.
'moo'+'nlit'='MOONLIT'
(Other definitions for moonlit that I've seen before include "gently enlightened?" , "like the bank Jessica used?" , "Illuminated by night" , "Gently illuminated" , "like Titania's unlucky meeting" .)