Showing lust for instance, I send lady nuts (6,3)
I believe the answer is:
deadly sin
'showing lust for instance' is the definition.
(lust is a deadly sin)
'i send lady nuts' is the wordplay.
'nuts' indicates anagramming the letters (nuts can mean crazy).
'i'+'send'+'lady'='isendlady'
'isendlady' anagrammed gives 'DEADLY SIN'.
(Other definitions for deadly sin that I've seen before include "Eg, lust or pride" , "Anger, say" , "envy for example" , "It's one of seven, gluttony say" , "Eg, lust or gluttony" .)