Winning service included tart for each person (6)

I believe the answer is:

apiece

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

'winning service included tart' is the wordplay.
'winning service' becomes 'ace' (ace is a kind of service. I am not sure about the 'winning' bit.).
'included' is an insertion indicator.
'tart' becomes 'pie' (both are baked goods).
'ace' enclosing 'pie' is 'APIECE'.

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.

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