Small drink for each child (6)
I believe the answer is:
nipper
'child' is the definition.
(I know that child can be written as nipper)
'small drink for each' is the wordplay.
'small drink' becomes 'nip' (I've seen this before).
'for each' becomes 'per' (I've seen this in another clue).
'nip'+'per'='NIPPER'
(Other definitions for nipper that I've seen before include "A pincer or a young boy" , "Young child or lobster's claw" , "Child (slang); one that 19s" , "Large claw of a crab" , "Little kid" .)