Gourmet gossip, not more eccentric (10)
I believe the answer is:
gastronome
'gourmet' is the definition.
(I know that gourmet can be written as gastronome)
'gossip not more eccentric' is the wordplay.
'gossip' becomes 'gas' (I've seen this before).
'eccentric' is an anagram indicator.
'not'+'more'='notmore'
'notmore' with letters rearranged gives 'tronome'.
'gas'+'tronome'='GASTRONOME'
(Other definitions for gastronome that I've seen before include "does he expect special fare?" , "Epicurean" , "foodie" , "One who loves to eat" .)