How one enjoys something that’s really great? (9)
I believe the answer is:
immensely
'how' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?
'one enjoys something that's really great?' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is found within 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 immensely that I've seen before include "To a very great extent" , "Hugely" .)