Dieter's World is hit (4)
I believe the answer is:
welt
'hit' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for welt that I've seen before include "narrow ridge" , "After blow, Mark" , "Wound from lash" , "Fire(place)" , "Raised mark on the skin" .)