Sounding congested (5)
I believe the answer is:
nasal
'sounding congested' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nasal that I've seen before include "To do with nose, say sound" , "Relating to one's hooter" , "Hooters" , "Sniffer's" , "Describing some hooter" .)