Being thus fed is childishly simple (5)

I believe the answer is:

spoon

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'being' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for spoon that I've seen before include "may create a stir" , "Ancient club" , "feeder" , "SECOND PART OF 15" , "No knife" .)

I've seen this clue in the Evening Standard.

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