Order in official document about author (6)
I believe the answer is:
asimov
'author' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'order in official document about' is the wordplay.
'order' becomes 'om' (Order of Merit).
'in' indicates putting letters inside.
'official document' becomes 'visa' (travel document).
'about' says the letters should be written in reverse.
'om' going inside 'visa' is 'vomisa'.
'vomisa' back-to-front is 'ASIMOV'.
Can you help me to learn more?
(Other definitions for asimov that I've seen before include "He wrote about robots" , "Isaac --, sci-fi author" , "Isaac ---, SF author" , "Isaac -, US sci-fi writer" , "See 22 Down" .)