Some hope Rishi'll disappear (6)
I believe the answer is:
perish
'disappear' is the definition.
(I've seen this in another clue)
'some hope rishi'll' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'PERISH' is hidden within 'hope rishill'.
(Other definitions for perish that I've seen before include "Die; decay" , "Suffer complete ruin or destruction" , "Pass away" , "Wither or die" , "Shuffle off this mortal coil" .)