Commotion, with lecturer interrupting worried boy rudely (9)
I believe the answer is:
obscenely
'rudely' is the definition.
Both the definition and answer are adverbs. Maybe you can see an association between them that I can't see?
'commotion with lecturer interrupting worried boy' is the wordplay.
'commotion' becomes 'scene' (I've seen this before).
'with' says to put letters next to each other.
'lecturer' becomes 'l' (abbreviation for lecturer).
'interrupting' indicates putting letters inside.
'worried' indicates an anagram (worry can mean to interfere with or disturb).
'scene'+'l'='scenel'
'boy' is an anagram of 'oby'.
'scenel' going into 'oby' is 'OBSCENELY'.
Can you help me to learn more?
(Another definition for obscenely that I've seen is " In a crude way".)