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Carrying Roo initially, Winnie the Pooh's friend set off (7)

Ross

I believe the answer is:

trigger

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'set off' is the definition.
(synonyms)

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(Other definitions for trigger that I've seen before include "Lever on gun" , "Roy Rogers' horse" , "Gun release mechanism" , "Activating device" , "Lever to activate firing mechanism" .)

I've seen this clue in The Telegraph.
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