Five-year-olds face (6)
I believe the answer is:
visage
'face' is the definition.
(I know that visage is a type of face)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for visage that I've seen before include "Clock" , "Face, aspect" , "A person's face, countenance" , "Mug" .)