Very great (7)
'very great' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for extreme that I've seen before include "Of the greatest intensity" , "Furthest or highest degree of something" , "Far beyond the norm" , "Ultimate" , "Immoderate" .)
I believe this clue is a double definition.
'very' is the first definition.
(thesaurus)
'great' is the second definition.
(both can mean excellent)
(Other definitions for super that I've seen before include "Peerless" , "(Of product) of extra fine quality" , "Exceptional" , "Top" , "Informally terrific, splendid" .)