Easy chance for MP perhaps? (6)

I believe the answer is:

sitter

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'easy chance' is the definition.
(as in a sitter in sport)

I don't understand the remainder of the clue.

(Other definitions for sitter that I've seen before include "Child minder, sounds sedentary" , "Easy shot or catch" , "easy target" , "Artist's model - an easy catch" , "One posing for artist" .)

I've seen this clue in The Sun.

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