Dings (5)
'dings' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dents that I've seen before include "Tends towards small depressions" , "reductions in size" , "Tends towards small depression" , "Tends to create small depressions" .)
(Other definitions for nicks that I've seen before include "Small cuts" , "Pinches or makes a small cut" , "Notches - arrests" , "Catches" , "Arrests (slang)" .)