Indignant actor splitting with... (7)

I believe the answer is:

angered

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

'indignant' is the definition.
(thesaurus)

'actor splitting with' is the wordplay.
'actor' becomes 'gere' (I can't justify this - if you can you should give a lot more credence to this answer).
'splitting' indicates putting letters inside (some letters split a word into two).
'with' becomes 'and'.
'gere' going into 'and' is 'ANGERED'.

Can you help me to learn more?

(Other definitions for angered that I've seen before include "In high dudgeon" , "Enraged (anag)" , "Infuriated" , "En garde (anag.)" , "Very annoyed" .)

I've seen this clue in The Daily Express.

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.