In my sin, maybe, there's nothing but bad practice (6)
I believe the answer is:
simony
'bad practice' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'in my sin maybe there's nothing' is the wordplay.
'in' indicates putting letters inside.
'maybe' indicates anagramming the letters.
'there's nothing' becomes 'o' (I've seen this in other clues).
'my'+'sin'='mysin'
'mysin' with letters rearranged gives 'simny'.
'simny' going around 'o' is 'SIMONY'.
'but' acts as a link.
Can you help me to learn more?
(Other definitions for simony that I've seen before include "The buying or selling of ecclesiastical privileges" , "cloth trade" , "Dealing in church property" , "purchase of church office" , "Trade in ecclesiastical pardons" .)