More than a plop (4)
I believe the answer is:
thud
'more than a plop' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for thud that I've seen before include "Clonk" , "Sound made by impact of heavy objects" , "Dull sound of impact" , "Dull heavy impact" , "Noise of dull impact" .)