Fern in Madeira spread across hotel (10)

I believe the answer is:

maidenhair

'fern' is the definition.
(maidenhair is a kind of fern)

'in madeira spread across hotel' is the wordplay.
'spread' indicates an anagram.
'across' means one lot of letters goes inside another.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'in'+'madeira'='inmadeira'
'inmadeira' is an anagram of 'maidenair'.
'maidenair' enclosing 'h' is 'MAIDENHAIR'.

(Another definition for maidenhair that I've seen is " fern?".)

I've seen this clue in The Telegraph.

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