It has a gripping purpose in fencing (4)
I believe the answer is:
hilt
This clue might be a double definition.
'it has a gripping purpose' is the first definition.
The definition suggests a singular noun which matches the answer.
'fencing' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'in' acts as a link.
Can you help me to learn more?
(Other definitions for hilt that I've seen before include "Handle of a sword or dagger" , "Handle of bladed weapon" , "Sword/dagger handle" , "One may back up to this" .)