Even changing the cover round brightened things up (7)
I believe the answer is:
livened
'brightened things up' is the definition.
I can't judge whether this defines the answer.
'even changing the cover round' is the wordplay.
'changing' is an anagram indicator.
'the cover' becomes 'lid' (lid is a kind of cover).
'round' is an insertion indicator.
'even' with letters rearranged gives 'vene'.
'vene' inserted inside 'lid' is 'LIVENED'.
Can you help me to learn more?
(Other definitions for livened that I've seen before include "Animated" , "made brighter" .)