It's usually transparently clear (5)
I believe the answer is:
glass
'clear' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for glass that I've seen before include "Eg, tumbler" , "Watch-face cover" , "Goblet" , "Perhaps schooner" , "Brittle transparent material" .)