Red label, yet I will appear troubled by design (12)

I believe the answer is:

deliberately

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'by design' is the definition.
(synonyms)

'red label yet i will appear troubled' is the wordplay.
'red label yet i' anagrams to 'DELIBERATELY'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for deliberately that I've seen before include "as intended" , "On purpose" , "Consciously and intentionally" .)

I've seen this clue in The Times.

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