Crossword Genius

Started getting letters from a Treasure Island character! (5)

Ross

I believe the answer is:

begun

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'started' is the definition.
(to start is to begin)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for begun that I've seen before include "Commenced" , "Opened" , "(Has) started" .)

I've seen this clue in the Evening Standard.
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