Crossword Genius

Convertible option coming from the leader (3-4)

Ross

I believe the answer is:

top-down

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'convertible' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

I don't understand how the remainder of the clue works.

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(Other definitions for top-down that I've seen before include "(Of management) run from above" , "how autocratic leaders make decisions" .)

I've seen this clue in The Times.
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