Answer: sloopy

AnswerCrossword Clue
SLOOPY1965 hit song, "Hang on .."
SLOOPYThe McCoys told her to hang on
SLOOPYGirl in a 1965 number 1 song title
SLOOPY"Hang On ..." (1965 chart-topper by the McCoys)
SLOOPY"Hang On ..."
SLOOPYOne told to hang on, in song