Old Testament book about Moses' successor (6)

I believe the answer is:

joshua

(Other definitions for joshua that I've seen before include "Moses's successor, victor of the Battle of Jericho" , "Israelite leader in Old Testament who fought the battle of Jericho" , "Conqueror of Jericho" , "OT book" , "Moses' successor as leader of the Israelites" .)

I've seen this clue in The Guardian.

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