Crusoe's favourite part of the week (6)

I believe the answer is:

friday

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'part of the week' is the definition.
(I know this)

I don't understand the remainder of the clue.

(Other definitions for friday that I've seen before include "Robinson Crusoe's manservant" , "One of seven" , "'Robinson Crusoe' character" , "It's payday for some" , "Man perhaps" .)

I've seen this clue in the Evening Standard.

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