No longer outside, requiring good support (7)

I believe the answer is:

backing

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'support' is the definition.
(I know that support can be written as backing)

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

Can you help me to learn more?

(Other definitions for backing that I've seen before include "promotion" , "Support" , "Supporting or betting on" , "change of wind" , "on the retreat" .)

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