Fuses obstruct air lining lower engine component (11,3)

I believe the answer is:

distributor cap

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'component' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

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

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