It sounds wet (5)
I believe the answer is:
splat
'wet' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for splat that I've seen before include "amusing noise" , "Piece of wood in a chair back" , "Sound of a soft wet landing" , "Noise on landing" , "Wet slapping sound" .)