Bury's within Patient Ombudsman's remit (6)
I believe the answer is:
entomb
'bury's' is the definition.
('entomb' can be a synonym of 'bury')
'within patient ombudsman's remit' is the wordplay.
'within' indicates a hidden word.
'ENTOMB' can be found hidden inside 'patient ombudsmans remit'.
(Other definitions for entomb that I've seen before include "Put in a grave" , "to finish Aida, for example" , "put six feet under . . ." , "Lay to rest in an underground vault" , "put to rest" .)