Bird in reeds brat disturbed (9)
I believe the answer is:
redbreast
'bird' is the definition.
(redbreast is a kind of bird)
'reeds brat disturbed' is the wordplay.
'disturbed' indicates an anagram.
'reeds'+'brat'='reedsbrat'
'reedsbrat' is an anagram of 'REDBREAST'.
'in' is the link.
(Other definitions for redbreast that I've seen before include "One tweets" , "Bird" , "Flapper" , "Type of robin" .)