Cook binned a key ingredient for chilli (6,4)
I believe the answer is:
kidney bean
'ingredient for chilli' is the definition.
(chilli often contains kidney beans)
'cook binned a key' is the wordplay.
'cook' indicates an anagram.
'binned'+'a'+'key'='binnedakey'
'binnedakey' with letters rearranged gives 'KIDNEY-BEAN'.
(Other definitions for kidney bean that I've seen before include "Pulse (of a renal shape?)" , "Red pulse" , "Vegetable" , "legume" .)