As a detective solving the mystery of the crossword clue ‘Crackerjack’, I would first break down the word to its individual parts to see if any clues can be found. ‘Cracker‘ could refer to something that is great or exceptional, and ‘jack‘ could refer to someone who is skilled or proficient. Thus, the answer could be a word that means exceptional skill or proficiency. A phrase that comes to mind is ‘whiz kid‘, meaning someone who is very skilled or knowledgeable in a particular area. And from there, I would notice that ‘whiz‘ fits the crossword space perfectly, and it also means a skilled or knowledgeable person, making it a perfect match for the given clue. And that, in turn, led me to the answer ‘WIZ‘, which seems to fit the bill for this puzzling crossword question.