Raged about a theatre being in the red (6)

I believe the answer is:

ranted

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'raged' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Perhaps there's an association between them I don't understand?

'a theatre being in the red' is the wordplay.
'theatre' becomes 'nt' (National Theatre).
'being in' means one lot of letters goes inside another.
'a'+'nt'='ant'
'ant' going into 'red' is 'RANTED'.

'about' is the link.

Can you help me to learn more?

(Other definitions for ranted that I've seen before include "Raved, mouthed off" , "Spoke wildly in ardent manner" , "Talked wildly and loudly" , "Talked wildly and angrily" , "Spoke wildly and incoherently" .)

I've seen this clue in the Evening Standard.

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