What does the cryptic crossword clue "Polytheists initially sacrificed their local banker (5)" mean?

The definition is "banker". The wordplay uses a deletion. INDUS (deletion) = INDUS; definition: "their local banker" The answer is INDUS.

Polytheists initially sacrificed their local banker (5)

Guardian Cryptic #28300 | 12 Across | 2020-11-25 flower