A stimulant either way (7)

I believe the answer is:

reviver

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'way' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for reviver that I've seen before include "One who resuscitates" , "Tonic" , "Restorer to life" , "Pick-me-up" .)

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