What does the cryptic crossword clue "Throw back tailless crustacean (7)" 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.

Throw back tailless crustacean (7)

Telegraph #29359 | 18 Across | 2020-05-09 flower

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Independent Cryptic #11052 (2022-03-16)