Signal case refashioned for anodynes (10)

I believe the answer is:

analgesics

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'for anodynes' is the definition.
('analgesic' can be a synonym of 'anodyne')

'signal case refashioned' is the wordplay.
'signal case' can be anagrammed to 'ANALGESICS'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

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

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