Peeved now about the green being in poor condition (7)
I believe the answer is:
angered
'peeved' is the definition.
(I've seen this in another clue)
'about the green being in poor condition' is the wordplay.
'about' is an anagram indicator.
'being in' is an insertion indicator.
'poor condition' becomes 'ad' (I can't justify this - if you can you should believe this answer much more).
'green' with letters rearranged gives 'ngere'.
'ngere' going within 'ad' is 'ANGERED'.
'now' acts as a link.
Can you help me to learn more?
(Other definitions for angered that I've seen before include "Infuriated" , "En garde (anag.)" , "Enraged (anag)" , "Very annoyed" , "In high dudgeon" .)