Married woman beset by need for food, an excellent person (9)
I believe the answer is:
humdinger
'an excellent person' is the definition.
(I know that humdinger is a type of excellent person)
'married woman beset by need for food' is the wordplay.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'woman' becomes 'di' (short for Diana).
'beset by' indicates putting letters inside ('beset' could historically mean 'cover').
'need for food' becomes 'hunger' (hunger is a need for food).
'm'+'di'='mdi'
'mdi' going inside 'hunger' is 'HUMDINGER'.
(Other definitions for humdinger that I've seen before include "Absolute belter" , "Peach" , "knockout" , "Excellent example" , "Something very large or excellent" .)