Rising, warbled; outside she grinds her teeth (7)

'her teeth' is the definition.
I can't judge whether this definition defines the answer.

'rising warbled outside she grinds' is the wordplay.
'rising' says the letters should be written in reverse (going up in a down clue).
'warbled' becomes 'sang' (I've seen this before).
'outside' says to put letters next to each other (outside can mean adjacent to).
'grinds' is an anagram indicator (I've seen 'grinding' mean this (letters must be ground into a new form)).
'sang' written backwards gives 'gnas'.
'she' anagrammed gives 'hes'.
'gnas'+'hes'='GNASHES'

Can you help me to learn more?