Weird sort breaking zip's opening below bridge (7)

I believe the answer is:

nostril

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'opening below bridge' is the definition.
I can't judge whether this defines the answer.

'weird sort breaking zip's' is the wordplay.
'weird' indicates an anagram.
'breaking' means one lot of letters goes inside another.
'zip' becomes 'nil' (both can mean zero).
'sort' is an anagram of 'ostr'.
'ostr' placed inside 'nil' is 'NOSTRIL'.

Can you help me to learn more?

(Other definitions for nostril that I've seen before include "Nasal aperture" , "Breathing aperture" , "A hole in the head" , "Nasal feature" , "Breathing opening for a human" .)

I've seen this clue in The Independent.

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