Scope for company to quietly enter weight (7)
I believe the answer is:
compass
'scope' is the definition.
(I know that scope can be written as compass)
'company to quietly enter weight' is the wordplay.
'company' becomes 'com' (as in .com).
'to quietly' becomes 'p' (p for piano and quiet).
'enter weight' becomes 'ass' (I can't justify this - if you can you should give a lot more credence to this answer).
'com'+'p'+'ass'='COMPASS'
'for' is the link.
Can you help me to learn more?
(Other definitions for compass that I've seen before include "using R [ROSE] for direction" , "Navigation instrument" , "Device with magnetic needle for determining direction" , "Directional instrument" , "Navigational instrument" .)