Pinch for each youngster (6)
I believe the answer is:
nipper
'youngster' is the definition.
(synonyms)
'pinch for each' is the wordplay.
'pinch' becomes 'nip' (nip can mean to pinch or bite).
'for each' becomes 'per' (per person).
'nip'+'per'='NIPPER'
(Other definitions for nipper that I've seen before include "Child (informal); one biting" , "young one" , "One pinches" , "Claw (large) - child (small)" , "Infant (colloq.)" .)