Maybe possessed lake south of rocky Macedonia (10)

I believe the answer is:

demoniacal

I'm a little stuck... Click here to teach me more about this clue!

'maybe possessed' is the definition.
'demoniacal' can be an answer for 'possessed' (synonyms). I'm unsure of the 'maybe' bit.

'lake south of rocky macedonia' is the wordplay.
'lake' becomes 'L' (geographical abbreviation).
'south of' means one lot of letters go next to another.
'rocky' indicates anagramming the letters.
'macedonia' with letters rearranged gives 'demoniaca'.
'l' put after 'demoniaca' is 'DEMONIACAL'.

Can you help me to learn more?

(Another definition for demoniacal that I've seen is " Fiendish".)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app