Crossword Genius

Strong support (4)

Ross

I believe the answer is:

pile

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'support' is the definition.
(pile is a kind of support)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pile that I've seen before include "lot of money" , "Large number" , "Post" , "supporting column" , "Stake" .)

I've seen this clue in the Evening Standard.
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