Strangely devious about rebellion gripping Right (12)
I believe the answer is:
surprisingly
'strangely' is the definition.
'devious about rebellion gripping right' is the wordplay.
'devious' becomes 'sly' (I've seen this before).
'about' indicates putting letters inside.
'rebellion' becomes 'uprising' (synonyms).
'gripping' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'sly' going around 'uprising' is 'suprisingly'.
'suprisingly' going around 'r' is 'SURPRISINGLY'.
(Other definitions for surprisingly that I've seen before include "Unexpectedly" , "Amazingly" .)