our man in/at something
From Longman Dictionary of Contemporary Englishour man in/at somethingour man in/at somethingREPRESENTATIVEa man who is the representative of a country or organization in a particular place our man in Rome a report on the accident from our man at the scene → manExamples from the Corpusour man in/at something• Still there was no demoralization of our men in line.• Soon, reports our man in the black wellies, all he had left were four golden orfe and a koi.