Angrier pose struck by stage performer (5-6)

I believe the answer is:

opera-singer

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

'stage performer' is the definition.
(I've seen this before)

'angrier pose struck' is the wordplay.
'angrier pose' can be anagrammed to 'OPERA-SINGER'.
However, I'm not sure how this is indicated.

'by' is the link.

Can you help me to learn more?

(Another definition for opera-singer that I've seen is " Eg, Caruso".)

I've seen this clue in The Irish Independent.

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