It could be Penn and Teller 's cut short? (4)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

SEAN ? – not sure what is going on here.  I am aware of a SEAN BEAN [actor, born 1959] and SEAN PENN [actor and director, born 1960], but I can’t add a letter to SEAN to get a word that means teller.  I could add two letters and get SEAN CE which might be an example of a deceased person telling the living some message.  Alternatively a SNEA K is someone who tells tails and if it is one letter short SNEA is an anagram [cut?]of SEAN