Superb morsel overlooked in savoury dish (4)
I believe the answer is:
rare
'superb' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?
'morsel overlooked in savoury dish' is the wordplay.
'morsel' becomes 'bit' (synonyms).
'overlooked in' suggests deleting specific letters.
'savoury dish' becomes 'rarebit' (I've seen this before).
'rarebit' with 'bit' removed is 'RARE'.
Can you help me to learn more?
(Other definitions for rare that I've seen before include "Very infrequent, lightly cooked" , "Ben Jonson was considered so" , "Scarce or uncommon" , "Very lightly cooked, meat say" , "Not well done!" .)