Used a lighter and caught the slow-moving (9)

I believe the answer is:

lethargic

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'slow-moving' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'used a lighter and caught' is the wordplay.
'used' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'caught' becomes 'c' (cricket abbreviation).
'a'+'lighter'='alighter'
'alighter' is an anagram of 'lethargi'.
'lethargi'+'c'='LETHARGIC'

'the' is the link.

Can you help me to learn more?

(Other definitions for lethargic that I've seen before include "reluctant to move" , "Enervated" , "Lacking in energy or vitality" , "Lacking energy/enthusiasm" , "Lackadaisical" .)

I've seen this clue in the Sydney Morning Herald.

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