US singer’s term coined for foul-mouthed radio presenter? (7)

I believe the answer is:

bluejay

'term coined for foul-mouthed radio presenter?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'us singer's' is the wordplay.
'us' becomes 'blue' (I can't explain this - if you can you should give a lot more credence to this answer).
'singer' becomes 'jay' (jay is a kind of birdanimal).
'blue'+'jay'='BLUEJAY'

I've seen this clue in The Times.

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.