One coin per person (6)

I believe the answer is:

apiece

'per person' is the definition.
(I've seen this before)

'one coin' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'coin' becomes 'piece' (I've seen this before).
'a'+'piece'='APIECE'

(Other definitions for apiece that I've seen before include "Per person" , "For or by each one of group" , "for everyone" , "A head" .)

I've seen this clue in The Everyman puzzle in The Observer.

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