Five ranted about being green (7)
I believe the answer is:
Here is my best explanation:
'being green' is the definition.
(I've seen this before)
'five ranted about' is the subsidiary indication.
'five' becomes 'v' ('v' can be a synonym of 'five').
'about' indicates an anagram.
'ranted' with letters rearranged gives 'erdant'.
(Other definitions for verdant that I've seen before include "Green with vegetation", "Of grass or fields, green", "Unsophisticated", "Rather green", "Leafy", "Covered with lush green grass or vegetation", "Green like grass or fields", "Green, lush", "Lush, green" and "Having green growth".)