Crossword Genius

Rotten month, I see (6)

Ross

I believe the answer is:

septic

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'rotten' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'month i see' is the wordplay.
'month' becomes 'sept' (Sept is an example).
'see' becomes 'C' (the word for the letter, according to Chambers).
'sept'+'i'+'c'='SEPTIC'

Can you help me to learn more?

(Other definitions for septic that I've seen before include "Type of tank" , "Contaminated with disease-causing bacteria" , "Putrid" , "Of wound, filled with pus" , "Of wound, forming pus" .)

I've seen this clue in the Evening Standard.
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