Yew, piece cut at intervals that's used for fencing (4)
I believe the answer is:
epee
'fencing' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
I also know that 'fencing' relates to this answer.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for epee that I've seen before include "Another fencing sword" , "Fighting blade" , "Type of sword" , "Use it to fence" , "Narrow fencing sword" .)