What does the cryptic crossword clue "Customers tell niece off (9)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Customers tell niece off (9)

Telegraph #27895 | 25 Across | 2015-09-01 flower

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Also seen in

Times Cryptic #28382 (2022-08-30)