Youngster in glasses (4)
I believe the answer is:
lass
'youngster' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'in glasses' is the wordplay.
'in' indicates a hidden word.
'LASS' is hidden within 'glasses'.
Can you help me to learn more?
(Other definitions for lass that I've seen before include "Young woman, girl" , "Girl (of Richmond Hill?)" , "Sweetheart" , "Scottish girl" , "Miss" .)