To each (3)
'to each' is the definition.
(synonyms)
This is all the clue.
(Other definitions for apiece that I've seen before include "Per person" , "For or by each one of group" , "for everyone" , "A head" .)
'to each' is the definition.
('per' can mean for each)
This is all the clue.
(Other definitions for per that I've seen before include "Preposition meaning for each" , "Preposition indicating by means of" , "According to" , "For each or every" .)