Stasi moved to hold famous author (6)
I believe the answer is:
asimov
'famous author' is the definition.
(Isaac Asimov)
'stasi moved to hold' is the wordplay.
'to hold' says the answer is hidden in the clue (I've seen 'held' mean this).
'ASIMOV' can be found hidden inside 'stasi moved'.
(Other definitions for asimov that I've seen before include "See 22 Down" , "Isaac --, sci-fi author" , "He wrote about robots" , "Isaac -, US sci-fi writer" , "novelist" .)