Crossword Genius

The Pope's top gear (5)

Ross

I believe the answer is:

tiara

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This clue could be a double definition.

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

'gear' is the second 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 can't see?

Can you help me to learn more?

(Other definitions for tiara that I've seen before include "Jewelled head band" , "Half a crown!" , "expensive headwear" , "special headgear" , "Ornamental headpiece" .)

I've seen this clue in The Guardian, The Globe and Mail and The Telegraph.
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