Crossword Genius

Socialist landlord’s special sort of day? (3-6)

Ross

I believe the answer is:

red-letter

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'special sort of day?' is the definition.
I can't judge whether this defines the answer.

'socialist landlord's' is the wordplay.
'socialist' becomes 'red' (socialism is often associated with the colour red).
'landlord' becomes 'letter' (landlords let property).
'red'+'letter'='RED-LETTER'

Can you help me to learn more?

(Other definitions for red-letter that I've seen before include "(Sign of day that's) memorably important" , "This day is memorable due to scarlet missive" , "Scarlet missive to signal memorable day" , "This day is memorable - hence scarlet missive" .)

I've seen this clue in The Times.
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