Crossword Genius

People who pull strings to get ranks? (5)

Ross

I believe the answer is:

tiers

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'ranks?' is the definition.
(tier is a kind of rank)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tiers that I've seen before include "Layers, strata" , "Layers or thicknesses" , "Row upon row" , "aprons for kids" , "drawers?" .)

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