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Declaim zero cost (5)

Ross

I believe the answer is:

orate

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'declaim' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for orate that I've seen before include "Speak pompously and at length" , "Make a formal speech" , "Harangue" , "Speak publicly" , "Make a formal address" .)

I've seen this clue in The Times and The Sunday Times.
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