Small child one with a bite (6)
I believe the answer is:
nipper
I believe this is a double definition.
'small child' is the first definition.
(I've seen this before)
'one with a bite' is the second definition.
(something which bites or nips)
(Other definitions for nipper that I've seen before include "One pinches" , "Little kid" , "Young person (with claws?)" , "Large claw of a crab" , "A pincer or a young boy" .)