Disgust as Sean crazy about gold (6)
I believe the answer is:
nausea
'disgust' is the definition.
(nausea is a kind of disgust)
'sean crazy about gold' is the wordplay.
'crazy' is an anagram indicator.
'about' means one lot of letters goes inside another.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'sean' anagrammed gives 'nsea'.
'nsea' going around 'au' is 'NAUSEA'.
'as' acts as a link.
(Other definitions for nausea that I've seen before include "Feeling of sickness or disgust" , "Condition of feeling imminent sickness" , "Seasickness" , "Ill-feeling" , "Squeamishness" .)