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Info gathered by heartless adjunct for spy (5)

Ross

I believe the answer is:

agent

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'spy' is the definition.
(thesaurus)

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(Other definitions for agent that I've seen before include "factor in Scotland" , "Substance that exerts some force or effect" , "One's representative" , "Performer's manager" , "Spy; service provider" .)

I've seen this clue in The Independent.
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