Oversupply (7)
'oversupply' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for glut that I've seen before include "A surfeit as of crops" , "Fill to excess" , "An excess of something so that prices fall" , "stuff" , "Excess, surfeit" .)
(Other definitions for sate that I've seen before include "Fill to satisfaction" , "spicy meat" , "Make content" , "Gorge, overeat" , "Supply to full capacity" .)
'oversupply' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for surplus that I've seen before include "Excess, extra" , "Superabundance" , "Unneeded extra" , "balance" , "Extra to requirements" .)