Proxy manager tied with ease by the sound of it (7)
I believe the answer is:
trustee
'proxy manager' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'tied with ease by the sound of it' is the wordplay.
'tied with' becomes 'trust' (I can't explain this - if you can you should believe this answer much more).
'by the sound of it' indicates a 'sounds like' (homophone) clue.
'ease' is a homophone of 'ee'.
'trust'+'ee'='TRUSTEE'
Can you help me to learn more?
(Other definitions for trustee that I've seen before include "Legal administrator" , "Runner of charity" , "Person who holds and administers property for another - have faith in him" , "Person with legal ownership of property to be used solely for specified purposes" , "Legal guardian" .)