One book elevated Arab - that chap’s a key Muslim figure (7)

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

One book elevated Arab – that chap’s a key Muslim figure I (=one) + B (=book) + RA (AR=Arabic; “elevated” indicates vertical reversal) + HIM (=that chap); Ibrahim is a prophet in Islam, said to have built the Kaaba in Mecca with his son Ishmael