Glorious yellow (6)
I believe the answer is:
golden
This clue is a double definition.
'glorious' is the first definition.
(thesaurus)
'yellow' is the second definition.
(I've seen this in another clue)
(Other definitions for golden that I've seen before include "'The silver apples of the moon / the . . . . . . apples of the sun' (Yeats)" , "In Woodstock we are this" , "Excellent" , "Very favourable (opportunity); aureate" , "Valuable" .)