Quiet place associated with one of Henry's wives — it's ideal (7)
I believe the answer is:
paragon
'ideal' is the definition.
(I know this)
'quiet place associated with one of henry's wives' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'place associated with one of henry's wives' becomes 'Aragon' (as in Catherine of Aragon, wife of Henry VIII).
'p'+'aragon'='PARAGON'
'it's' is the link.
(Other definitions for paragon that I've seen before include "Very good example" , "Perfect example of a quality" , "A model as of virtue" , "Flawless model" , "An ideal" .)