The re-opening is a revelation (10)
I believe the answer is:
disclosure
'revelation' is the definition.
(I know that revelation can be written as disclosure)
'the re-opening is a' is the wordplay.
I cannot quite understand how this works, but
're' is found in the answer.
'opening' could be 'os' (os is a kind of opening) and 'os' is found in the answer.
'is' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for disclosure that I've seen before include "Act of revelation" , "leak" , "Release" , "Laying bare" , "Publication" .)