Novelist's written about energy company partner (9)
I believe the answer is:
bedfellow
'partner' is the definition.
(I've seen this before)
'novelist's written about energy company' is the wordplay.
'novelist' becomes 'bellow' (I've seen this before).
'written about' indicates putting letters inside.
'energy company' becomes 'dfe' (I can't explain this - if you can you should believe this answer much more).
'bellow' enclosing 'dfe' is 'BEDFELLOW'.
Can you help me to learn more?
(Other definitions for bedfellow that I've seen before include "Person slept with" , "Partner (in the boudoir?)" , "Close associate or partner" , "Mate" , "Colleague" .)