Secluded places; retreats (5)
I believe the answer is:
nooks
I believe this clue is a double definition.
'secluded places' is the first definition.
(I've seen this in another clue)
'retreats' is the second definition.
(nook is a kind of retreat)
(Other definitions for nooks that I've seen before include "Sheltered corners" , "Secluded retreats" , "out-of-the-way places" , "Cubbyholes" , "In security areas" .)