A stimulant either way (7)
I believe the answer is:
reviver
'way' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
I can't explain the rest of the clue.
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" .)