Crossword Genius

Reportedly foul resting-place? (5)

Ross

I believe the answer is:

roost

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This clue could be a double definition.

'reportedly foul' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'resting-place?' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for roost that I've seen before include "Shetland tidal water" , "Night spot for birds/bats" , "Where bats congregate" , "Perch on a branch" , "The cock rules it" .)

I've seen this clue in The Sun.
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