In retrospect, genteel Biden's palatable (6)
I believe the answer is:
edible
'palatable' is the definition.
(associated in meaning)
'in retrospect genteel biden's' is the wordplay.
'EDIBLE' is hidden backwards within the letters.
But, I'm unsure how the hidden word is indicated.
(Other definitions for edible that I've seen before include "It's all right to scoff" , "Esculent" , "Comestible" , "One's fare should be" , "Suitable for use as food" .)