Crossword Genius

Spooner's inundation chart provides protection from murky water (7)

Ross

I believe the answer is:

mudflap

'protection from murky water' is the definition.

I don't understand the rest of the clue.

(Other definitions for mudflap that I've seen before include "Perhaps Ford's bodyguard" , "Splash guard on a wheel" .)

I've seen this clue in The Guardian.
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