Ruined broadcast by one politician (8)

I believe the answer is:

impaired

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'ruined' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'broadcast by one politician' is the wordplay.
'broadcast' becomes 'aired' (synonyms).
'by' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'politician' becomes 'MP' (Member of Parliament).
'i'+'mp'='imp'
'aired' put after 'imp' is 'IMPAIRED'.

Can you help me to learn more?

(Other definitions for impaired that I've seen before include "Made worse or less effective" , "Caused weakening, damaged" , "Disabled" , "handicapped" , "Injured; weakened" .)

I've seen this clue in The Times.

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