Red wound given the green light (7)
I believe the answer is:
scarlet
'red' is the definition.
(I know that red can be written as scarlet)
'wound given the green light' is the wordplay.
'wound' becomes 'scar' (I've seen this before).
'given' is a charade indicator (letters next to each other).
'the green light' becomes 'let' (I can't justify this - if you can you should believe this answer much more).
'scar'+'let'='SCARLET'
Can you help me to learn more?
(Other definitions for scarlet that I've seen before include "Red colour of clarets" , "Fallen" , "bloody?" , "Brilliant red colour" , "Cherry-red" .)