Squirrel's hangout (4)
I believe the answer is:
tree
'squirrel's hangout' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tree that I've seen before include "Genealogist's graphic" , "Conifer, for example" , "Tall wooden plant" , "Eg, alder" , "Birch, say" .)