Aiding getting a portion (7)
I believe the answer is:
helping
This clue is a double definition.
'aiding' is the first definition.
('help' can be a synonym of 'aid')
'a portion' is the second definition.
(I know that portion can be written as helping)
'getting' is the link.
(Other definitions for helping that I've seen before include "Amount put on plate" , "Giving assistance" , "Assisting" , "Food portion" , "Aiding" .)