Exquisite having been cooked lightly (4)
I believe the answer is:
rare
I believe this clue is a double definition.
'exquisite' is the first definition.
(thesaurus)
'having been cooked lightly' is the second definition.
(Other definitions for rare that I've seen before include "Very infrequent or scarce" , "not often spotted" , "Scarce as hen's teeth!" , "early" , "Scarce or uncommon" .)