Lady dines out showing gluttony perhaps? (6,3)
I believe the answer is:
deadly sin
'gluttony perhaps?' is the definition.
(gluttony is a kind of deadly sin)
'lady dines out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'lady'+'dines'='ladydines'
'ladydines' anagrammed gives 'DEADLY SIN'.
'showing' acts as a link.
(Other definitions for deadly sin that I've seen before include "It's one of seven, gluttony say" , "Greed, perhaps" , "Anger, say" , "a cause of damnation" , "greed, or lust" .)