Drink for each child (6)
I believe the answer is:
nipper
'child' is the definition.
(I know that child can be written as nipper)
'drink for each' is the wordplay.
'drink' becomes 'nip' (I've seen this before).
'for each' becomes 'per' (I've seen this before).
'nip'+'per'='NIPPER'
(Other definitions for nipper that I've seen before include "Small child or crab's claw" , "Informal young child or lobster claw" , "Small child (informal)" , "One pinches" , "Small boy or lobster claw" .)