Important double save: top class work, by George! (5,7)
I believe the answer is:
major barbara
'work by george' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'important double save top class' is the wordplay.
'important' becomes 'major' (major can mean of great importance).
'double' indicates the doubling of some letters.
'save' becomes 'bar' (I've seen this before).
'top class' becomes 'a' (top grade).
'bar' duplicated is 'barbar'.
'major'+'barbar'+'a'='MAJOR BARBARA'
Can you help me to learn more?
(Other definitions for major barbara that I've seen before include "GBS Salvation Army heroine" , "G.B. Shaw play" .)