For each (6)
'for each' is the definition.
('per' can mean for each)
This is all the clue.
(Other definitions for per that I've seen before include "According to" , "For each or every" , "Preposition meaning for each" , "Preposition indicating by means of" .)
'for each' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for apiece that I've seen before include "A head" , "for everyone" , "Per person" , "For or by each one of group" .)