Answer: AWHO

AnswerCrossword Clue
AWHO"Horton Hears .."
AWHOWhat Horton heard
AWHODr. Seuss's "Horton Hears .."
AWHO"Horton Hears ..."
AWHODr. Seuss's "Horton Hears ..."
AWHOSeuss's "Horton Hears ..."
AWHO"Horton Hears ..!"
AWHOEnd of a Seuss title
AWHOSeuss's "Horton Hears ....."
AWHO"Horton Hears ...!" (Dr. Seuss book)
AWHO'Horton Hears --'
AWHODr. Seuss' 'Horton Hears --!'
AWHO'Horton Hears --!'
AWHODr. Seuss' "Horton Hears ..."
AWHO"Horton Hears ...!"