1. rogue or unprincipled person.   heretic   gnome   knave   lexicographer   Hint Half-n-half Clue   2. dummy or portrait of person.   fancier   dilettante   effigy   knave   Half-n-half Clue   3. debauched or licentious person.   genealogist   diva   dupe   libertine   Half-n-half Clue   4. deserter of party or principles.   renegade   devotee   kleptomaniac   insomniac   Half-n-half Clue   5. person who studies fishes.   hermit   lexicographer   emissary   ichthyologist   Half-n-half Clue   6. person who studies reptiles.   gnome   dipsomaniac   herpetologist   dolt   Half-n-half Clue   7. one who intrudes into others' affairs (for profit).   dolt   interloper   hedonist   laity   Half-n-half Clue