Division between the nostrils (6)

I believe the answer is:

septum

(Other definitions for septum that I've seen before include "Division between nostrils" , "Partition in nose between nostrils" , "Partition between two chambers" , "Dividing partition between the nostrils" , "Partition between two cavities of the nose" .)

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

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