Tempestuous tale about James Bond's boss (6)
I believe the answer is:
stormy
'tempestuous' is the definition.
(I know that tempestuous can be written as stormy)
'tale about james bond's boss' is the wordplay.
'tale' becomes 'story' (synonyms).
'about' means one lot of letters goes inside another.
'james bond's boss' becomes 'M' (M is the head of MI6 in the James Bond series).
'story' enclosing 'm' is 'STORMY'.
(Other definitions for stormy that I've seen before include "Gusty" , "Full of angry outbursts" , "Emotional" , "by no means smooth" , "'. . . . . . Weather' (sung by Billie Holiday, say)" .)