Answer: oldest

AnswerCrossword Clue
OLDEST"The ... trick in the book!"
OLDESTType of trick in the book?
OLDESTA Guinness world record adjective
OLDESTGuinness World Record adjective
OLDESTLike Jackie Jackson, in the Jackson 5
OLDESTGuinness Book superlative
OLDESTGuinness superlative
OLDESTMost elderly
OLDESTGuinness adjective
OLDESTThe ... trick in the book!
OLDESTFrom furthest back
OLDESTDescribing a doyen
OLDESTMost antiquated
OLDESTLongest-lived
OLDESTMost venerable
OLDESTHarvard, among U.S. colleges
OLDESTLike Methuselah
oldestHaving lived for a long time; no longer young
oldestUsed to refer to the first of two or more similar things
oldestDating from far back; long-established or known
oldestOf a specified age
oldest(of a form of a language) As used in former or earliest times
oldestUsed to express affection, familiarity, or contempt
oldestBelonging only or chiefly to the past; former or previous
oldestOLD, living for a long time
oldestMade or built long ago
OLDESTAdjective for St. Augustine, Fla.
oldestHaving the characteristics or showing the signs of age
oldestA person or animal of the age specified
oldestPossessed or used for a long time
OLDESTLike St. Augustine vis-a-vis all U.S. cities
OLDESTLike Fenway among all major-league ballparks
OLDESTFirst established
OLDESTLike the one born first
OLDESTMost passe
OLDESTMost senior
OLDESTHaving the most privileges, maybe
OLDESTMost ancient
OLDESTJackie, vis- -vis the rest of the Jackson 5
OLDESTFirst born