Ferdinand de Lesseps isn't showing some presence of pus-forming bacteria? (6)

I believe the answer is:

sepsis

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'pus-forming bacteria?' is the definition.

'ferdinand de lesseps isn't showing some presence' is the wordplay.
'SEPSIS' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for sepsis that I've seen before include "Presence of harmful bacteria (in a wound)" , "rotting" , "Blood poisoning" , "Putrefaction in tissue" , "corruption" .)

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

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