Ungodly display by mischievous boy, one yet reforming (7)

I believe the answer is:

impiety

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for impiety that I've seen before include "Irreligion" , "Lack of reverence" , "godlessness" , "Irreverence, profanity" , "sacrilege" .)

I've seen this clue in The Hindu.

Want a hint initially instead of a full solution? Install my app