Answer: stamper

AnswerCrossword Clue
STAMPERIt may set a date
STAMPERP. O. canceler.
STAMPERFoot pounder.
STAMPERPost Office worker.
STAMPERPostal worker.
STAMPERPost-office worker
STAMPERMail room worker
stamperone that stamps (to bring the foot down heavily)