Lamentation (4)
I believe the answer is:
moan
'lamentation' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for moan that I've seen before include "Low sound of pain" , "Complain; mournful sound" , "Murmur of pain; grumble" , "Express pain" , "Complain; rhymes with money lent" .)