Glance at youngster upset in disgrace (7)
I believe the answer is:
Here is my best explanation:
'disgrace' is the definition.
'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'.
'in' acts as a link.