Crossword Genius

Study in The Observer (7)

Ross

I believe the answer is:

monitor

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'study' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for monitor that I've seen before include "Prefect; a loudspeaker" , "Keep a check on" , "Check on - large lizard" , "A television or computer screen" , "Keep under surveillance" .)

I've seen this clue in the Irish Times.
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