Agitated bather, out of breath? (6)

I believe the answer is:

bertha

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

'breath?' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'agitated bather' is the wordplay.
'agitated' indicates anagramming the letters.
'bather' with letters rearranged gives 'BERTHA'.

'out of' is the link.

Can you help me to learn more?

(Other definitions for bertha that I've seen before include "big woman?" , "Big girl" , "Big ..., heavy German howitzer in World War 1" , "43-ton German howitzer, Big _____" , "Big - - , WW1 gun" .)

I've seen this clue in the Evening Standard.

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.