Crossword Genius

Part of format the writer used for book (7)

Ross

I believe the answer is:

matthew

'for book' is the definition.
(book of the Bible)

'part of format the writer' is the wordplay.
'part of' indicates a hidden word.
'MATTHEW' can be found hidden inside 'format the writer'.

'used' is the link.

(Other definitions for matthew that I've seen before include "This chap" , "Apostle to whom the first Gospel is ascribed" , "Gospel writer" , "Gospel-writer" , "religious text" .)

I've seen this clue in The Guardian.
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