Get no hearing in criminal case of awful offender, alas (4,2,4,4)

I believe the answer is:

fall on deaf ears

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

'get no hearing' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'criminal case of awful offender alas' is the wordplay.
'criminal' indicates an anagram.
'case of' means to remove the middle letters (outsides of).
'awful' with its middle taken out is 'al'.
'al'+'offender'+'alas'='aloffenderalas'
'aloffenderalas' is an anagram of 'FALL ON DEAF EARS'.

'in' is the link.

Can you help me to learn more?

(Another definition for fall on deaf ears that I've seen is " totally ignored".)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.