Quietly contract to use the property if you are willing (6)
I believe the answer is:
please
'use the property if you are willing' is the definition.
I can't tell whether this defines the answer.
'quietly contract' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'contract' becomes 'lease' (leasing is a kind of contracting).
'p'+'lease'='PLEASE'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for please that I've seen before include "Be good enough to" , "See 10 Across" , "See pal (anag) -- charm" , "Want" , "Asleep (anag)" .)