Overcoat or tutus for tailoring (7)

I believe the answer is:

surtout

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'overcoat' is the definition.
(I know that surtout is a type of overcoat)

'or tutus for tailoring' is the wordplay.
'or tutus' anagrams to 'SURTOUT'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

I've seen this clue in The Guardian.

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