TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: SONGS 
Clue: The title song in an Elvis film, it was written for the 1937 Bing Crosby film "Waikiki Wedding"

SOLUTION: blue hawaii

PROBLEM: Category: 10-LETTER WORDS 
Clue: (Jimmy of the Clue Crew in Seattle)  Used in "Hamlet", it's the common British term for the vendor I'm buying from

SOLUTION: fishmonger

PROBLEM: Category: "C"-SECTION 
Clue: This viral inflammation of the larynx & trachea is common in kids, especially from 6 months to 3 years

SOLUTION:
croup