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Sort of pill that gives 50 p.c. vigour before half a minute? (7)

Ross

I believe the answer is:

vitamin

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But I can't explain it at all! Could you help me understand?

(Other definitions for vitamin that I've seen before include "Riboflavin, for example" , "Organic substance essential to life" , "Tim, Ivan (anag)" , "A, B, C, D, E or K" , "Essential substance in food" .)

I've seen this clue in The Hindu.
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