Crossword Genius

Young predator put away — copper goes by book (4,3)

Ross

I believe the answer is:

wolf cub

I'm a little stuck... Click here to teach me more about this clue!

'young predator' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for wolf cub that I've seen before include "old junior Scout" , "Young carnivore" , "Young scout" , "one of six as previously named" , "one of Mowgli's brothers" .)

I've seen this clue in The Guardian.
Want a hint initially instead of a full solution? Install my app