Weary word (4)
I believe the answer is:
alas
'weary word' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for alas that I've seen before include "Expression of grief or misfortune" , "Lackaday" , "Cry of woe" , "Too bad, so sad" , "What a shame!" .)