The supporter can get a pair for about £50 (6)

I believe the answer is:

pillar

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'the supporter' is the definition.
(pillar is a kind of supporter)

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

Can you help me to learn more?

(Other definitions for pillar that I've seen before include "monument?" , "Vertical stone support" , "Column, support" , "Supporting column" , "Upright post" .)

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