Publicly exposed secret about study group beaten on quality (10)
I believe the answer is:
outclassed
'beaten on quality' is the definition.
(I've seen this before)
'publicly exposed secret about study group' is the wordplay.
'publicly exposed secret' becomes 'outed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' is an insertion indicator.
'study group' becomes 'class' (I've seen this before).
'outed' going around 'class' is 'OUTCLASSED'.
Can you help me to learn more?
(Other definitions for outclassed that I've seen before include "Totally surpassed" , "Surpassed in quality" , "Well beaten" , "Beaten in quality" , "Easily defeated" .)