What does the cryptic crossword clue "Reptile's big noise, touching back (5)" 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.

Reptile's big noise, touching back (5)

Guardian Cryptic #26608 | 23 Down | 2015-06-26 flower

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