1) British slang for the head 2) Crazy 3) Dolt 4) Duffer 5) Dupe 6) Easy mark 7) Fall guy 8) Fool 9) Gull 10) Innocent victim 11) Kind of change 12) Lout or dupe 13) Mark 14) One left holding the bag 15) One played for a fool 16) Patsy 17) Sap or sucker 18) Soft touch 19) Sucker 20) The head 21) Victim Found on https://www.crosswordclues.com/clue/chump
Chump noun [ Confer Icelandic kumbr a chopping, English chop .] A short, thick, heavy piece of wood. Morton. Chump end , the thick end; as, the chump end of a joint of meat. Dickens. Found on http://www.encyclo.co.uk/webster/C/76
a stupid person; dolt: Don't be a chump--she's kidding you along. · a short, thick piece of wood. · the thick, blunt end of anything. · the head. · crazy. Found on https://www.infoplease.com/dictionary/chump