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Detective’s assistant initially has to miss coming events? (6)

Ross

I believe the answer is:

watson

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'detective's' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for watson that I've seen before include "Tom - - , golfer" , "Sherlock Holmes's doctor buddy" , "Sherlock Holmes's sidekick" , "Holmes's associate" , "Holmes's assistant" .)

I've seen this clue in The Times.
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