Covering over with the whitewash, perhaps (6)
I believe the answer is:
hiding
'covering' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for hiding that I've seen before include "Hushing up" , "Place of concealment" , "Keeping quiet" , "Trying to avoid" , "Not publicising" .)