"Die!" said the frog! (5)

I believe the answer is:

croak

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'die' is the definition.
(I know that die can be written as croak)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for croak that I've seen before include "Make a froggy sound" , "Frog's call" , "Frog's sound - die" , "Caw" , "Noise from pond life - die" .)

I've seen this clue in the Sydney Morning Herald.

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