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"lair" is also used as a crossword clue. If that's what you saw, the answer is often den (3 letters).
Definitions
the habitation of wild animals
Word origin
From Middle English leir, leire, lair, lare, from Old English leġer (“couch, bed”), from Proto-Germanic *legrą, from Proto-Indo-European *legʰ-.
Used in a sentence
“O dainty dew, O morning dew / That gleamed in the world's first dawn, did you / And the sweet grass and manful oaks / Give lair and rest / To him who toadwise sits and croaks / His death-behest?”
““Would you go into the dragon's lair, my peerless Wiglaf?””
“[H]e did a little scout work, and discovered the lair of that old woman.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Animal den”4 letters
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