Cook bean, admitting it's disgusting for a snack (8)
I believe the answer is:
doughnut
'for a snack' is the definition.
(doughnut is a type of snack)
'cook bean admitting it's disgusting' is the wordplay.
'cook bean' becomes 'donut' (I am not sure about this - if you are sure you should believe this answer much more).
'admitting' means one lot of letters goes inside another (admit can mean to welcome in or accept).
'it's disgusting' becomes 'ugh' (I've seen this before).
'donut' going around 'ugh' is 'DOUGHNUT'.
Can you help me to learn more?
(Other definitions for doughnut that I've seen before include "Small ring-shaped fried cake" , "Sweet circular snack" , "Sweet fried snack" , "Sweet fried cake" , "Sweet circular cake" .)