Fat copper parking to get plant (9)
I believe the answer is:
buttercup
'plant' is the definition.
(buttercup is a kind of plant)
'fat copper parking' is the wordplay.
'fat' becomes 'butter' (I've seen this before).
'copper' becomes 'cu' (chemical symbol).
'parking' becomes 'p' (abbreviation on road signs).
'butter'+'cu'+'p'='BUTTERCUP'
'to get' is the link.
(Other definitions for buttercup that I've seen before include "Rich yellow wild flower" , "Weed with rich yellow flowers" , "Flowering plant" , "growth in the field" , "Bumboat woman" .)