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Low on energy, pureed the garlic (9)

Ross

I believe the answer is:

lethargic

I'm a little stuck... Click here to teach me more about this clue!

'low' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?

'energy pureed the garlic' is the wordplay.
'the garlic' anagrams to 'LETHARGIC'.
However, I'm not clear how the anagram is indicated.

'on' is the link.

Can you help me to learn more?

(Other definitions for lethargic that I've seen before include "Enervated" , "Lacking in energy or vitality" , "Apathetic, lacking energy" , "The garlic (anag.)" , "lack of energy" .)

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