Teasing good for youth, presumably (8)
I believe the answer is:
badinage
'teasing' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for badinage that I've seen before include "bit of playful repartee" , "Josh" , "Backchat, banter" , "Frivolous backchat" , "Playful banter" .)