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At home, book is available (9)

Ross

I believe the answer is:

inreserve

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'available' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'at home book' is the wordplay.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'book' becomes 're-serve' (as in booking or reserving in advance).
'in'+'reserve'='INRESERVE'

'is' acts as a link.

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I've seen this clue in The Daily Express.
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