Pretend to be an impresario (3,2,2,3)

I believe the answer is:

put on an act

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

I don't understand the rest of the clue.

(Other definitions for put on an act that I've seen before include "Pretend" , "Fake" .)

I've seen this clue in The Guardian.

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