Brother with endless stomach pain devours cold vegetable (8)
I believe the answer is:
broccoli
'vegetable' is the definition.
(I know that Broccoli is a type of vegetable)
'brother with endless stomach pain devours cold' is the wordplay.
'brother with' becomes 'bro' (I can't explain this - if you can you should give a lot more credence to this answer).
'endless' means to remove the last letter.
'stomach pain' becomes 'colic' (type of stomach complaint).
'devours' indicates putting letters inside (inserted letters are devoured).
'cold' becomes 'C' (eg on taps).
'colic' with its last letter taken away is 'coli'.
'coli' going around 'c' is 'ccoli'.
'bro'+'ccoli'='BROCCOLI'
Can you help me to learn more?
(Other definitions for broccoli that I've seen before include "producer in pictures?" , "green veg" , "Green vegetable - producer of Bond films" , "Type of cabbage" , "Dark green vegetable" .)