Potter character somewhat covered by that? Not entirely (7)
I believe the answer is:
tabitha
'potter character' is the definition.
The definition suggests a singular noun which matches the answer.
'somewhat covered by that? not entirely' is the wordplay.
'somewhat' becomes 'a bit' (a bit).
'covered by' means one lot of letters goes inside another.
'not entirely' means to remove the last letter (not all of the word).
'that' with its final letter removed is 'tha'.
'abit' placed within 'tha' is 'TABITHA'.
Can you help me to learn more?
(Other definitions for tabitha that I've seen before include "girl" , "Girl's name" , "female" .)