1) Applicant 2) Applier 3) Auction attendee 4) Auction participant 5) Bridge player, at times 6) Car-auction participant 7) Ebay customer 8) eBay user 9) English surname 10) Goren, at times 11) Nodding one, sometimes 12) North 13) One in action at an auction 14) Participate in an auction 15) Someone who makes an offer Found on https://www.crosswordclues.com/clue/bidder