Cheek expressing disgust after dwelling on the last character (7)

I believe the answer is:

hutzpah

I'm a little stuck... Click here to teach me more about this clue!

'dwelling on the last character' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'cheek expressing disgust after' is the wordplay.
'cheek' becomes 'hutzpa' (hutzpa is a kind of cheek).
'expressing disgust' becomes 'h' (I can't explain this - if you can you should believe this answer much more).
'after' is a charade indicator (letters next to each other).
'hutzpa'+'h'='HUTZPAH'

Can you help me to learn more?

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app