Infant's sock (6)
I believe the answer is:
bootee
'infant's sock' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bootee that I've seen before include "Baby's sock-like shoe" , "A baby's knitted foot covering - sounds like loot" , "Jolly" , "Knitted foot-covering" , "Infant's shoe." .)