Canberra's under the devil's influences (7)
I believe the answer is:
impacts
'influences' is the definition.
(I know this)
'canberra's under the devil's' is the wordplay.
'canberra' becomes 'acts' (I can't justify this - if you can you should give a lot more credence to this answer).
'under' means one lot of letters go next to another.
'the devil' becomes 'imp' (devilish creature).
'acts' put after 'imp' is 'IMPACTS'.
Can you help me to learn more?
(Other definitions for impacts that I've seen before include "Collisions of jolts" , "Bumps into, collides with" , "It's camp (anag)" .)