Evil organisation quietly residing in secret complex (7)
I believe the answer is:
spectre
'evil organisation' is the definition.
(organisation in James Bond novels and films)
'quietly residing in secret complex' is the wordplay.
'quietly' becomes 'p' (p for piano and quiet).
'residing in' is an insertion indicator.
'complex' indicates anagramming the letters.
'secret' with letters rearranged gives 'sectre'.
'p' placed within 'sectre' is 'SPECTRE'.
(Other definitions for spectre that I've seen before include "after-image?" , "Narrow ravine" , "Respect for a ghost" , "Sceptre (anag.)" , "Wraith" .)