Astronomy scam takes in Arkansas Gazette (10)

I believe the answer is:

stargazing

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'astronomy' is the definition.
(thesaurus)

'scam takes in arkansas gazette' is the wordplay.
'scam' becomes 'sting' (sting can mean a scam or deceptive scheme).
'takes in' means one lot of letters goes inside another.
'arkansas' becomes 'ar' (abbreviation for the US state).
'gazette' becomes 'gaz' (I can't explain this - if you can you should give a lot more credence to this answer).
'ar'+'gaz'='argaz'
'sting' placed around 'argaz' is 'STARGAZING'.

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