Birds for example disturb rest (6)
I believe the answer is:
egrets
'birds' is the definition.
(egret is a kind of bird)
'example disturb rest' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'disturb' is an anagram indicator (I've seen 'disturbed' mean this (the order of letters is disturbed)).
'rest' is an anagram of 'rets'.
'eg'+'rets'='EGRETS'
'for' is the link.
(Other definitions for egrets that I've seen before include "creatures" , "Fliers" , "Greets in way of certain herons (" , "waders" , "Greets like fishing eagles" .)