Crossword Genius

Pilgrim's bad experience somewhere near Windsor (6)

Ross

I believe the answer is:

slough

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This could be a double definition.

'pilgrim's bad' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'experience somewhere near windsor' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

Can you help me to learn more?

(Other definitions for slough that I've seen before include "Swamp; cast off (skin)" , "Swamp; Berkshire town" , "Discard - bog" , "poet wanted destroyed" , "shed covering" .)

I've seen this clue in The Guardian.
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