Sluggish finding nitre (5)

I believe the answer is:

inert

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'sluggish' is the definition.
('inert' can be a synonym of 'sluggish')

'nitre' is the wordplay.
'nitre' anagrams to 'INERT'.
Though, I am unsure how this is indicated.

'finding' acts as a link.

Can you help me to learn more?

(Other definitions for inert that I've seen before include "Lifeless or static" , "Torpid" , "Unmoving" , "like neon" , "Lifeless; apathetic" .)

I've seen this clue in The Mirror.

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