Sort of hat used by gardeners (6)

I believe the answer is:

cloche

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'sort of hat' is the definition.
(I know that cloche is a type of hat)

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

Can you help me to learn more?

(Other definitions for cloche that I've seen before include "protection for young stock?" , "seedlings may need it" , "Nursery plant protection" , "Style of hat for a woman" , "Seedling cover" .)

I've seen this clue in The Globe and Mail.

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