This person's terribly alarmed by company's overseas consort (6,6)

I believe the answer is:

imelda marcos

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'overseas consort' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'this person's terribly alarmed by company's' is the wordplay.
'this person's' becomes 'im' (this person means the crossword setter themselves).
'terribly' indicates an anagram.
'by' is a charade indicator (letters next to each other).
'company's' becomes 'cos' (abbreviation).
'alarmed' anagrammed gives 'eldamar'.
'im'+'eldamar'+'cos'='IMELDA MARCOS'

Can you help me to learn more?

I've seen this clue in The Telegraph.

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