Pruners

2 clues
Branch managers?
Groundskeepers, at times
Similar answers:
Abners
Abnersingleday
Abrahamzapruder
Abstainers
Abunchofvintners
Acorners
Afterdinnerspeaker
Airconditioners
Airliners
Aligners
Aliners
Almoners
Amfmtuners
Aners
Arraigners
Asners
Assumesownership
Atoners
Attainers
Awakeners