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Prog rock band upset Ms Hird sounding a bit like INXS (8)

Ross

I believe the answer is:

plethora

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

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

'band upset ms hird sounding a bit like inxs' is the wordplay.
I cannot quite understand how this works, but
'band' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'sounding' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
'a' is within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for plethora that I've seen before include "Abundant supply" , "Glut, over-abundance" , "Cornucopia -- superfluity" , "almost too much" , "Excessive quantity" .)

I've seen this clue in The Independent.
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