It's usually transparently clear (5)

I believe the answer is:

glass

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'clear' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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" .)

I've seen this clue in the Evening Standard.

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