Exquisite morsel missed in savoury dish (4)
I believe the answer is:
rare
'exquisite' is the definition.
(thesaurus)
'morsel missed in savoury dish' is the wordplay.
'morsel' becomes 'bit' (synonyms).
'missed in' suggests deleting specific letters.
'savoury dish' becomes 'rarebit' (I've seen this before).
'rarebit' with 'bit' removed is 'RARE'.
(Other definitions for rare that I've seen before include "may be bloody" , "Seldom - unusual" , "Unusual - exquisite" , "Very infrequent or scarce" , "Still red inside (as hens' teeth?)" .)