Crossword Puzzle Study of immunity

Clue: Study of immunity

Immunity offerer (ANTITOXIN with 9 letters)
Military officer in charge of food and clothing (QUARTERMASTER with 13 letters)
Church officer's residence (VICARAGE with 8 letters)
Executive office piece (CREDENZA with 8 letters)
Calvin Klein offering (SCENT with 5 letters)
Enterprise offering elation? (DELIGHTINGINDUSTRY with 18 letters)
Vice president's official entrance march (HAILCOLUMBIA with 12 letters)
Official OKs (SEALSOFAPPROVAL with 15 letters)
Number of African countries with espaÃ±ol as an official language (UNO with 3 letters)
Undo officially (REPEAL with 6 letters)