Facing group of pupils, old master holding large book (5,5)
I believe the answer is:
bleak house
'old master holding large book' is the definition.
'Bleak House' can be an answer for 'book' (Charles Dickens novel). I am unsure of the 'old master holding large' bit.
'facing group of pupils' is the wordplay.
'facing' becomes 'bleak' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'group of pupils' becomes 'house' (pupils often belong to school houses).
'bleak'+'house'='BLEAK HOUSE'
Can you help me to learn more?
(Other definitions for bleak house that I've seen before include "7 27's [CHARLES DICKENS] book" , "Novel by Dickens" , "Novel satirising the old court of Chancery" , "* [DICKENS WORK]" , "Dickens' desolate domicile" .)