In retrospect feel Biden is somewhat unpalatable (8)
I believe the answer is:
inedible
'unpalatable' is the definition.
(unpalatable can mean not very nice to eat)
'in retrospect feel biden is somewhat' is the wordplay.
'in retrospect' says the letters should be written in reverse (in retrospect means looking back).
'somewhat' says the answer is hidden in the clue.
'elbideni' can be found hidden inside 'feel biden is'.
'elbideni' in reverse letter order is 'INEDIBLE'.
(Other definitions for inedible that I've seen before include "Not fit for eating" , "not course material?" , "Uneatable" , "Awful to taste" , "Not good as food" .)