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Sounds like a pretty girl who's taking the plunge! (6,4)

Ross

I believe the answer is:

diving bell

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

'the plunge' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'sounds like a pretty girl who's' is the wordplay.
I cannot quite see how this works, but
'girl' could be 'bell' and 'bell' is found within the answer.
The remaining letters 'diving' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'taking' is the link.

Can you help me to learn more?

(Other definitions for diving bell that I've seen before include "Sea-bottom work chamber supplied air by tube" , "It lowers one in the main" .)

I've seen this clue in The Irish Independent.
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