Youngster's prize books removed (3)
I believe the answer is:
boy
'youngster's' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for boy that I've seen before include "SECOND HALF OF 14" , "Young male" , "Male child" , "Son" , "Lad" .)