Cuts up foodstuff on board (5)
I believe the answer is:
snubs
'cuts' is the definition.
(I know this)
'up foodstuff on board' is the wordplay.
'up foodstuff' becomes 'nub' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' means one lot of letters goes inside another.
'board' becomes 'ss' (I've seen this in other clues).
'nub' inserted into 'ss' is 'SNUBS'.
Can you help me to learn more?
(Other definitions for snubs that I've seen before include "Cold-shoulders" , "Rebuffs" .)