Baudelaire's retreat (4)

I believe the answer is:

lair

I'm a little stuck... Click here to teach me more about this clue!

'retreat' is the definition.
(both can mean a private hideout)

'baudelaire's' is the wordplay.
'LAIR' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for lair that I've seen before include "Home of a beast" , "Waylay" , "Habitat of a wild animal" , "Rail around animal's den" , "secluded spot?" .)

I've seen this clue in The Telegraph.

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