A labyrinth has daughter dumbfounded (6)
I believe the answer is:
amazed
'dumbfounded' is the definition.
(synonyms)
'a labyrinth has daughter' is the wordplay.
'labyrinth' becomes 'maze' (synonyms).
'has' says to put letters next to each other.
'daughter' becomes 'd' (genealogical abbreviation).
'a'+'maze'+'d'='AMAZED'
(Other definitions for amazed that I've seen before include "Overwhelmed with wonder" , "Staggered" , "Completely surprised" , "Greatly surprised and impressed" , "knocked for six" .)