Very unpleasant cold food for breakfast, not good (5)
I believe the answer is:
cruel
'good' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I don't see?
'very unpleasant cold food for breakfast not' is the wordplay.
I cannot quite understand how this works, but
'cold' could be 'c' (eg on taps) and 'c' is found within the answer.
'food' could be 'rue' (rue is a kind of food) and 'rue' is present in the answer.
A single letter 'l' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cruel that I've seen before include "Sadistic, causing suffering" , "Devoid of pity" , "Diabolical" , "Lucre (anag.)" , "Callous" .)