From Longman Dictionary of Contemporary Englishgentleman farmerˌgentleman ˈfarmer noun [countable] especially British English TACLASS IN SOCIETYa man belonging to a high social class who owns and runs a farm, but who usually hires people to do the work
Examples from the Corpus
gentleman farmer• The interviewing panel was civil and included a peer of the realm, a major-General, and a gentleman farmer.• Walking from room to room, I felt like a gentleman farmer riding his fences, master of all he surveyed. 