Withdrawing support? (7)

I believe the answer is:

backing

I believe this is a double definition.

'withdrawing' is the first definition.
(I've seen this before)

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

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

I've seen this clue in the Sydney Morning Herald, The Telegraph, The Guardian and The Globe and Mail.

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