Quality raised in top hospital monument (8)
I believe the answer is:
cenotaph
'monument' is the definition.
(cenotaph is a kind of monument)
'quality raised in top hospital' is the wordplay.
'quality' becomes 'tone' (synonyms).
'raised' says the letters should be written backwards.
'in' means one lot of letters goes inside another.
'top' becomes 'cap' (synonyms).
'hospital' becomes 'h'.
'tone' backwards is 'enot'.
'enot' put into 'cap' is 'cenotap'.
'cenotap'+'h'='CENOTAPH'
(Other definitions for cenotaph that I've seen before include "Empty tomb" , "Whitehall memorial" , "Tomb-like monument to people buried elsewhere" , "Monument honouring the fallen" , "Whitehall monument" .)