Crossword Genius

US agent bored when adding up (3)

Ross

I believe the answer is:

fed

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'us agent' is the definition.
(short for a federal agent)

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

Can you help me to learn more?

(Other definitions for fed that I've seen before include "supplied with power?" , "US agent" , "Banking authority" , "Given food to eat" , "American cop" .)

I've seen this clue in The Irish Times.
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