Fear gone, leader of revolution embraced (5)
I believe the answer is:
dread
'fear' is the definition.
(I know that fear can be written as dread)
'gone leader of revolution embraced' is the wordplay.
'gone' becomes 'dead' (similar in meaning).
'leader of' indicates taking the first letters.
'embraced' means one lot of letters goes inside another (inserted letters are embraced).
The first letter of 'revolution' is 'r'.
'dead' going around 'r' is 'DREAD'.
(Other definitions for dread that I've seen before include "fright" , "Awe" , "Trepidation" , "Terrible fear" , "Deep fear" .)