Ruin ground with introduction of parking (5)
I believe the answer is:
spoil
'ruin' is the definition.
(thesaurus)
'ground with introduction of parking' is the wordplay.
'ground' becomes 'soil' (soil is a kind of ground**).
'with' is an insertion indicator.
'introduction of' says to take the initial letters.
The first letter of 'parking' is 'p'.
'soil' going around 'p' is 'SPOIL'.
(Other definitions for spoil that I've seen before include "Wreck" , "Destroy or ruin" , "baby" , "Butcher" , "Having dredged-up material" .)