Refrain in a children's song ... or a literal feature of 17-, 25-, 42- and 55-Across 5 letters

Crossword clues for Refrain in a children's song ... or a literal feature of 17-, 25-, 42- and 55-Across 5 letters

Answer	Clue
EIEIO	Refrain in a children's song ... or a literal feature of 17-, 25-, 42- and 55-Across