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In favour of person ennobled by Boris providing drug (6)

Ross

I believe the answer is:

prozac

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'drug' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for prozac that I've seen before include "Upper" , "Controversial antidepressant" , "Common antidepressant drug" , "medication" , "Anti-depressant trade mark" .)

I've seen this clue in The Independent.
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