Crossword Genius

About acting? (5)

Ross

I believe the answer is:

doing

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'acting?' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for doing that I've seen before include "Performing a task" , "Impersonating" , "thrashing" , "Carrying out action" , "Effecting" .)

I've seen this clue in the Evening Standard.
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