Crossword Genius

Cover that prevents damage to the sewer (7)

Ross

I believe the answer is:

thimble

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for thimble that I've seen before include "sewer cover?" , "Belt him (anag)" , "Caucus-race prize (Alice)" , "digital screen" , "Cover for finger when sewing" .)

I've seen this clue in The Irish Independent.
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