Note the condition of the property (6)
I believe the answer is:
estate
'the property' is the definition.
(estate is a kind of property)
'note the condition' is the wordplay.
'note' becomes 'e' (musical note).
'the condition' becomes 'state' (the state something is in).
'e'+'state'='ESTATE'
'of' acts as a link.
(Other definitions for estate that I've seen before include "Property to be inherited" , "Everything person possesses" , "park perhaps" , "Property and possessions of the deceased" , "A group of buildings built together in one development" .)