Crossword Genius

Phantom summons number composed by someone else (12)

Ross

I believe the answer is:

ghostwritten

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'someone else' is the definition.
I can't judge whether this defines the answer.

'phantom summons number' is the wordplay.
'phantom' becomes 'ghost' (ghost is a kind of phantom).
'summons' becomes 'writ' (legal summons).
'number' becomes 'ten' (ten is a kind of number).
'ghost'+'writ'+'ten'='GHOSTWRITTEN'

'composed by' acts as a link.

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I've seen this clue in The Daily Express.
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