1. one who studies relation between organisms and environment.   imbecile   functionary   founder   ecologist   Hint Half-n-half Clue   2. person with morbid tendency to drink alcohol.   gynaecologist   malefactor   martinet   dipsomaniac   Half-n-half Clue   3. clumsy or rough-mannered person.   luminary   malefactor   malcontent   lout   Half-n-half Clue   4. person who is idiotic or weak in mind.   martinet   imbecile   founder   virago   Half-n-half Clue   5. aggressive and bellicose patriot.   hedonist   infidel   horde   jingoist   Half-n-half Clue   6. person who studies lineage and pedigree.   egoist   malcontent   lexicographer   genealogist   Half-n-half Clue   7. person who is unable to pay his debts.   insolvent   iconoclast   equestrian   incendiary   Half-n-half Clue