Ascertains, when one removes the wrapper? (9)
I believe the answer is:
discovers
'ascertains when one removes' is the definition.
I can't tell whether this defines the answer.
'wrapper?' is the wordplay.
I cannot really see how this works, but
'wrapper?' could be 'cover' and 'cover' is found in the answer.
The remaining letters 'diss' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'the' acts as a link.
Can you help me to learn more?
(Another definition for discovers that I've seen is " Unearths".)