Oil ran about and caused damage (7)
I believe the answer is:
spoiled
'caused damage' is the definition.
Although both the answer and definition are past participle verbs, I can't see how one could define the other.
'oil ran about' is the wordplay.
'ran' becomes 'sped' (I've seen this in another clue).
'about' is an insertion indicator.
'oil' put into 'sped' is 'SPOILED'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for spoiled that I've seen before include "Damaged, harmed" , "Rotten" , "Of child, excessively pampered" , "Ruined" , "Marred" .)