Each one welcomed to a pizza pie celebration (6)
I believe the answer is:
apiece
'each one' is the definition.
(I've seen this before)
'welcomed to a pizza pie celebration' is the wordplay.
'APIECE' is hidden in amongst the letters.
But, I am uncertain how this is indicated.
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" , "A head" , "Per person" .)