Highchair wear (3)
I believe the answer is:
bib
'highchair wear' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bib that I've seen before include "Baby's feeding cloth" , "What may catch food" , "Child's garment protector when eating" , "Protective cloth; fish" , "Child's mealtime cloth" .)