Notice sticker up in office electioneer vacated supporting Clinton (10)

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

Notice sticker up in office electioneer vacated, supporting Clinton BILL (=Clinton, i.e. former US President) + POST (=office) + E <lectionee> R (“vacated” means all middle letters are dropped); a bill poster is someone who pastes posters onto billboards, hence “notice sticker up”