Cobblers flash buttocks with glare (9)
I believe the answer is:
moonshine
'cobblers flash' 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 a link between them I don't understand?
'buttocks with glare' is the wordplay.
'buttocks with' becomes 'moon' (I am not sure about this - if you are sure you should believe this answer much more).
'glare' becomes 'shine' (glare can mean to shine or gleam).
'moon'+'shine'='MOONSHINE'
Can you help me to learn more?
(Other definitions for moonshine that I've seen before include "hard stuff" , "Light in the still of the night" , "bunk" , "Smuggled alcohol" , "Illicit spirit - foolish talk" .)