A grizzly youngster? (4,3)
I believe the answer is:
bear cub
'a grizzly youngster?' is the definition.
(I've seen this in another clue)
'grizzly youngster?' is the wordplay.
'grizzly' becomes 'bear' (I've seen this in another clue).
'youngster?' becomes 'cub' (cub can mean a young person).
'bear'+'cub'='BEAR CUB'
(Other definitions for bear cub that I've seen before include "Young carnivore" , "Ursine baby" , "Paddington, perhaps" , "youngster?" .)