Crossword Genius

Keepers of ideally clean sheets (7)

Ross

I believe the answer is:

goalies

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'keepers' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for goalies that I've seen before include "Keepers of nets - so agile" , "Footballers" , "defence people" , "They defend the net" .)

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