Answer: lmnop

AnswerCrossword Clue
LMNOP

They're pre-Q

LMNOP

Queue before Q

LMNOP

End of the second line of the traditional alphabet song

LMNOP
Pre-Q queue
LMNOP
Between K and Q
LMNOPRun in "The Alphabet Song"
LMNOP12-16 of a group
LMNOP12 to 16 of 26