bell ringer (
http://definr.com/bell ringer)
n 1: a person who rings church bells (as for summoning the
congregation) [syn:
toller,
ringer]
2: someone who plays musical handbells
3: something that exactly succeeds in achieving its goal; "the
new advertising campaign was a bell ringer"; "scored a
bull's eye"; "hit the mark" [syn:
bull's eye,
mark]