Shrill sounds made through pursed lips (8)
I believe the answer is:
whistles
'shrill sounds made through pursed lips' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for whistles that I've seen before include "Sounds of air forced through small openings" , "Makes shrill sounds through pursed lips" , "It's Welsh (anag.)" , "Referees' tools" , "Pipes with finger holes" .)