Part or share (7)
I believe the answer is:
This clue is a double definition.
'part' is the first definition.
(I know that part can be written as portion)
'share' is the second definition.
(I know that share can be written as portion)
(Other definitions for portion that I've seen before include "Segment" , "Part of a whole" , "allotment" , "A lot of" , "Helping - fate" .)