Crossword Genius

How is impresario donning a territory? (7,2,2,3)

Ross

I believe the answer is:

putting on an act

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'how is impresario' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'donning a territory?' is the wordplay.
'donning' becomes 'putting on' ('put on' can be a synonym of 'don').
'a' becomes 'an'.
'territory?' becomes 'act' (I can't explain this - if you can you should give a lot more credence to this answer).
'puttingon'+'an'+'act'='PUTTING ON AN ACT'

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I've seen this clue in the Sydney Morning Herald.
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