Kid who pinches things (6)
I believe the answer is:
nipper
'kid' is the definition.
(I know that kid can be written as nipper)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for nipper that I've seen before include "A pincer or a young boy" , "Little one" , "Child - ankle-biter?" , "It may pinch" , "Child (informal); one biting" .)