Moore for one is understood (5)

I believe the answer is:

roger

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'is understood' is the definition.
(I've seen this in another clue)

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

(Other definitions for roger that I've seen before include "I've got the message" , "Boy's name - received and understood" , "Sir - de Coverley, English country dance" , "Jolly man" , "Boy's name - I will do what you say" .)

I've seen this clue in The Sun.

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