Yes, Spanish rubberneck may turn one's stomach (6)

I believe the answer is:

sicken

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'turn one's stomach' is the definition.
'sicken' can be an answer for 'turn' (thesaurus). I'm unsure of the 'one's stomach' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sicken that I've seen before include "Make ill or nauseate" , "Make ill or totally disgust" , "Become unwell" , "Become ill" .)

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

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