Glance at youngster upset in disgrace (7)
I believe the answer is:
scandal
'disgrace' is the definition.
(thesaurus)
'glance at youngster upset' is the wordplay.
'glance at' becomes 'scan'.
'youngster' becomes 'lad' (I've seen this before).
'upset' is a reversal indicator.
'lad' back-to-front is 'dal'.
'scan'+'dal'='SCANDAL'
'in' acts as a link.
(Other definitions for scandal that I've seen before include "Subject of Sheridan's school" , "Shock" , "Malicious gossip" , "It injures reputation" , "something injurious to one's reputation" .)