Course around globe is fixed (6)
I believe the answer is:
sorbet
'course' is the definition.
(sorbet is a kind of course)
'around globe is fixed' is the wordplay.
'around' is an insertion indicator.
'globe' becomes 'orb' ('orb' can be a synonym of 'globe').
'is fixed' becomes 'set' ('set' can be a synonym of 'fixed').
'orb' inserted into 'set' is 'SORBET'.
(Other definitions for sorbet that I've seen before include "Water ice to cleanse the palate" , "Fruit juice and water ice" , "Granita-like dessert" , "Frozen dessert" , "Refresher course" .)