Book, not initially non-fiction (4)

Guardian Cryptic #29148 | 21 Across | 2023-08-14
Generating...

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

A subtraction: [t]RUTH (‘non-fiction’ treated as a noun) minus the first letter (‘not initially’). My first thought was [f]ACTS. Wrong Testament.

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