Crossword Genius

Part of vital passage where island crop is transported (6,4)

Ross

I believe the answer is:

spinal cord

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

'part of vital passage' is the definition.
'spinal cord' can be an answer for 'part' (spinal cord is a kind of part). I am not certain of the 'of vital passage' bit.

'island crop is transported' is the wordplay.
'is transported' is an anagram indicator.
'island'+'crop'='islandcrop'
'islandcrop' is an anagram of 'SPINAL CORD'.

'where' is the link.

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I've seen this clue in The Times.
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