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Window part (4)

Ross

There are a few possibilities for this:

'window part' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sill that I've seen before include "Horizontal intrusion of igneous rock between sedimentaries, as in much of Hadrian's Wall" , "Slab at foot of window" , "Window edge" , "Shelf at the foot of a window" , "Mass of rock" .)

I've seen this clue in the Penny Press, The New York Times, the LA Times, The Star Tribune, the USA Today and the King Feature Syndicate.
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