Keep reduced portion of shrimp over -- I shared (10)
I believe the answer is:
impoverish
'keep' is the definition.
(I know that impoverish is a kind of keep)
'of shrimp over i shared' is the wordplay.
'of' indicates the answer is hidden within the clue.
'IMPOVERISH' can be found hidden inside 'shrimp over i shared'.
'reduced portion' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for impoverish that I've seen before include "Make poor" , "beggar" , "Spoil the quality of" .)