Fowl perches (6)
I believe the answer is:
roosts
'fowl perches' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for roosts that I've seen before include "So sort out for birds' perches" , "Perches like the birds" , "Henhouses" , "where people settled?" , "'Rests on a perch, like a chicken (6)'" .)