Crossword Genius

Essence of an herb bringing energy for playboy, essentially (5)

Ross

I believe the answer is:

theme

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'essence' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for theme that I've seen before include "Melody on which variations are constructed" , "Thread, melody" , "sort of tune" , "Signature tune" , "Topic; melody" .)

I've seen this clue in The Hindu.
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