Standard piece of skin damage (3)
I believe the answer is:
tan
'skin damage' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Maybe there's an association between them I don't understand?
'standard piece' is the wordplay.
'piece' indicates a hidden word.
'TAN' is hidden in the letters of 'standard'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for tan that I've seen before include "Prepare leather" , "Get the effect of the sun." , "Lie in sun" , "Beat the colour" , "Yellow-brown colour" .)