Performance in coat (6)

I believe the answer is:

action

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'performance' is the definition.
(I've seen this in another clue)

'in coat' is the wordplay.
'in coat' can be anagrammed to 'ACTION'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for action that I've seen before include "The mechanism of, say, a watch" , "Watch operating mechanism" , "Battle - suit" , "Director's call" , "Legal proceeding brought by one party against another" .)

I've seen this clue in The Irish News.

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