Crossword Genius

Rank skirt, but not top (5)

Ross

I believe the answer is:

order

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'rank' is the definition.
(I know that rank can be written as order)

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

Can you help me to learn more?

(Other definitions for order that I've seen before include "Annual film award (5)" , "Instruction - arrangement" , "architectural style" , "Society of monks/nuns" , "Direct - class - instruction" .)

I've seen this clue in The Guardian.
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