Are they flying when the potter has thrown them? (7)

I believe the answer is:

saucers

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'are they' is the definition.
The definition suggests a plural noun which matches the answer.

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

(Other definitions for saucers that I've seen before include "Items of crockery" , "part of service?" .)

I've seen this clue in the Evening Standard.

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