Supports fights (5)
I believe the answer is:
spars
This could be a double definition.
'supports' is the first definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe you can see a link between them that I can't see?
'fights' is the second definition.
(sparring is a kind of fighting)
Can you help me to learn more?
(Other definitions for spars that I've seen before include "Boxes" , "disputes" .)