Here are the possible solutions for herb's energy level clue
Answer
Clue
Relevancy
basilmetabolism
Clue
Herb's energy level?
Means of turning an herb into energy?
basil
Clue
Herb garden herb
Definition
an aromatic herb
eula
Clue
Herb's mother-in-law in the comic strip "Herb and Jamaal"
uhuru
Clue
Herb's daughter in the comic strip "Herb and Jamaal"
ozone
Clue
Low-level pollution or high-level protection
Definition
an allotropic form of oxygen present in the atmosphere
ptomaineconcourse
Clue
Warning sign at a train station's food court? (NOTE: The original sign, without my additions, actually exists. It's in Grand Central Terminal in NYC, on the lower level — the food court level. The sig