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Standing up for supplied backing on conclusion (9)

Ross

I believe the answer is:

defending

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'standing up' is the definition.
The definition and answer can be both to do with communicating as well as being present participle verbs.
Perhaps there's a link between them I don't understand?

'supplied backing on conclusion' is the wordplay.
'supplied' becomes 'fed' (feeding is a kind of supplying).
'backing' says the letters should be written backwards.
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'conclusion' becomes 'ending' (synonyms).
'fed' reversed gives 'def'.
'def'+'ending'='DEFENDING'

'for' acts as a link.

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I've seen this clue in the Sydney Morning Herald.
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