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Lofty, snug retreat (5 letter answer)
The answer EYRIE is seen occasionally, appearing about once every 800 puzzles.
Home on high
High nest: Var.
Isolated nest: Var.
Lofty nest: Var.
EYRIE as a noun:
1. (aerie, aery, eyrie, eyry) = the lofty nest of a bird of prey (such as a hawk or eagle)
2. (aerie, aery, eyrie, eyry) = any habitation at a high altitude