Devilish way of working in study (5)
I believe the answer is:
demon
'working in study' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?
'devilish way' is the wordplay.
'devilish' becomes 'demo' (I can't justify this - if you can you should give a lot more credence to this answer).
'way' becomes 'n' (Compass direction - North).
'demo'+'n'='DEMON'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for demon that I've seen before include "ace" , "Expert" , "Fiend, devil" , "Fallen angel" , "Wizard" .)