Reportedly bound to some furniture - that's useful for sailors (4,5)

I believe the answer is:

tide table

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'that's useful for sailors' is the definition.
I can't judge whether this defines the answer.

'reportedly bound to some furniture' is the wordplay.
'reportedly' indicates a 'sounds like' (homophone) clue.
'bound' becomes 'tied' ('tie' can be a synonym of 'bind').
'to some furniture' becomes 'table' (table is a kind of furniture).
'tied' sounds like 'tide'.
'tide'+'table'='TIDE-TABLE'

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I've seen this clue in The Daily Express.

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