Lois managed to get parking at ruin (5)
I believe the answer is:
spoil
'ruin' is the definition.
(I know that ruin is a more specific form of the action spoil)
'lois managed to get parking' is the wordplay.
'managed' indicates an anagram.
'to get' is an insertion indicator.
'parking' becomes 'p' (abbreviation on road signs).
'lois' is an anagram of 'soil'.
'soil' going around 'p' is 'SPOIL'.
'at' is the link.
(Other definitions for spoil that I've seen before include "Having dredged-up material" , "Diminish or destroy the value or quality" , "Butcher" , "Be too nice to - strip" , "Harm or destroy" .)