Rising non-professional or sovereign (5)
I believe the answer is:
royal
'sovereign' is the definition.
(I've seen this before)
'rising non-professional or' is the wordplay.
'rising' shows that the letters should be reversed in order (going up in a down clue).
'non-professional' becomes 'lay' (I've seen this before).
'lay'+'or'='layor'
'layor' backwards is 'ROYAL'.
(Other definitions for royal that I've seen before include "With kingly status" , "- Icing, - flush, - jelly" , "Sort of jelly, flush or blue" , "William, say" , "like Alonso" .)