Like a slug chewing the garlic? (9)

I believe the answer is:

lethargic

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'like a slug' is the definition.
I can't tell whether this definition defines the answer.

'chewing the garlic?' is the wordplay.
'chewing' indicates an anagram.
'the'+'garlic'='thegarlic'
'thegarlic' anagrammed gives 'LETHARGIC'.

Can you help me to learn more?

(Other definitions for lethargic that I've seen before include "without energy" , "Short of energy" , "Lacking energy/enthusiasm" , "Lacking in energy or vitality" , "Lackadaisical" .)

I've seen this clue in The Telegraph.

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