For each experience included (3)
I believe the answer is:
per
'for each' is the definition.
(per person)
'experience included' is the wordplay.
'included' indicates the answer is hidden within the clue (I've seen 'include' mean this).
'PER' can be found hidden inside 'experience'.
(Other definitions for per that I've seen before include "For each or every" , "Preposition meaning for each" , "Preposition indicating by means of" , "According to" .)