Directions repeated about lamp to inform (9)
I believe the answer is:
enlighten
'inform' is the definition.
(I know that enlighten is a more specific form of the action clarify)
'directions repeated about lamp' is the wordplay.
'directions' becomes 'en' (east and north).
'repeated about lamp' becomes 'lighten' (I can't explain this - if you can you should believe this answer much more).
'en'+'lighten'='ENLIGHTEN'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for enlighten that I've seen before include "Give instruction" , "free from superstition" , "Give knowledge and understanding to" , "remove prejudice" , "Give knowledge to, inform" .)