Celebrity chef perhaps may have art treasure arranged round middle of house (12)
I believe the answer is:
restaurateur
'celebrity chef perhaps' is the definition.
(someone who owns a restaurant)
'art treasure arranged round middle of house' is the wordplay.
'arranged' indicates an anagram (letters rearranged).
'round' indicates putting letters inside.
'middle of' means to look at the middle letters.
The middle of 'house' is 'u'.
'art'+'treasure'='arttreasure'
'arttreasure' with letters rearranged gives 'restarateur'.
'restarateur' placed around 'u' is 'RESTAURATEUR'.
'may have' is the link.
(Other definitions for restaurateur that I've seen before include "Person running establishment" , "Owner of eating place" , "One catering to diners" , "I supply meals" , "Person running eating house" .)