Crossword Genius

Say drain has front missing (5)

Ross

I believe the answer is:

utter

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'say' is the definition.
(to utter something is to speak or say it)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for utter that I've seen before include "Complete; absolute" , "Absolute - say" , "Dead" , "Say the words" , "Pure" .)

I've seen this clue in The Daily Express.
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