Remains to help people with their figures (5)

I believe the answer is:

stays

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'remains' is the definition.
(to stay in a place is to remain there)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stays that I've seen before include "Settles" , "Boards, lodges" , "Remains (in place)" , "Remains; corset" , "Remains; support wires" .)

I've seen this clue in the Evening Standard.

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