Scope provides almost perfect sight (7)
I believe the answer is:
purview
'scope' is the definition.
(I know that purview is a type of scope)
'almost perfect sight' is the wordplay.
'almost perfect' becomes 'pur' (I can't justify this - if you can you should give a lot more credence to this answer).
'sight' becomes 'view' (synonyms).
'pur'+'view'='PURVIEW'
'provides' is the link.
Can you help me to learn more?
(Other definitions for purview that I've seen before include "... experience range" , "Scope, range" , "Compass, range" , "Range of thought" , "Ken" .)