Green pipe going across road area (7)
I believe the answer is:
verdant
'green' is the definition.
(I've seen this before)
'pipe going across road area' is the wordplay.
'pipe going' becomes 'vent' (I can't explain this - if you can you should believe this answer much more).
'across' indicates putting letters inside.
'road' becomes 'rd' (abbreviation).
'area' becomes 'a' (maths abbreviation).
'rd'+'a'='rda'
'vent' placed around 'rda' is 'VERDANT'.
Can you help me to learn more?
(Other definitions for verdant that I've seen before include "Unsophisticated" , "Rather green" , "Green like grass or fields" , "Having green growth" , "Covered with lush green grass or vegetation" .)