Green and rough constitutes hazard (8)
I believe the answer is:
endanger
'hazard' is the definition.
(I've seen this before)
'green and rough' is the wordplay.
'rough' is an anagram indicator (a rough or broken ordering of the letters).
'green'+'and'='greenand'
'greenand' is an anagram of 'ENDANGER'.
'constitutes' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for endanger that I've seen before include "Put in trouble" , "Pose a threat to" , "Put in harm's way" , "Put someone at risk" , "Imperil" .)