Being septic, perhaps, possibly stank (5)

I believe the answer is:

tanks

I'm a little stuck... Click here to teach me more about this clue!

'being septic perhaps' is the definition.
I can't tell whether this defines the answer.

'possibly stank' is the wordplay.
'possibly' is an anagram indicator.
'stank' is an anagram of 'TANKS'.

Can you help me to learn more?

(Other definitions for tanks that I've seen before include "Reservoirs - military vehicles" , "Armed vehicles" , "Armored military vehicles" , "Armoured military vehicles" , "Bombs" .)

I've seen this clue in the Evening Standard.

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