Satanic force to be coming from east (4)
I believe the answer is:
'satanic' is the definition.
(similar in meaning)
'force to be coming from east' is the wordplay.
'force' becomes 'e' (E is the symbol of electromotive force).
'to be coming' becomes 'liv' (I can't justify this - if you can you should believe this answer much more).
'from east' is a reversal indicator.
'liv' back-to-front is 'vil'.
Can you help me to learn more?
(Other definitions for evil that I've seen before include "very naughty" , "Live (anag.)" , "Harmful; unlucky" , "A live sort of badness" , "Malignant" .)