International blog rewritten by top-grade student (6)
I believe the answer is:
global
'international' is the definition.
(similar in meaning)
'blog rewritten by top-grade student' is the wordplay.
'rewritten' indicates an anagram.
'by' means one lot of letters go next to another.
'top grade' becomes 'A' (top academic grade).
'student' becomes 'l' (as in L-plates for learner drivers).
'blog' with letters rearranged gives 'glob'.
'glob'+'a'+'l'='GLOBAL'
(Other definitions for global that I've seen before include "Across the world" , "everywhere" , "Universal" , "Like big village" , "all over the place" .)