Crossword Genius

Watertight floodgate (7)

Ross

I believe the answer is:

staunch

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

I can't explain the rest of the clue.

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(Other definitions for staunch that I've seen before include "solid" , "Trusty - steadfast" , "Reliable" , "making it watertight" , "Faithful and true" .)

I've seen this clue in The Telegraph.
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