We bear it (4)
I believe the answer is:
onus
This could be a double definition.
'we bear' is the first definition.
(we carry anything on us)
'it' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for onus that I've seen before include "albatross?" , "'Responsibility, task or burden (4)'" , "Encumbrance" , "Capulet opponent (R&J)" , "Liability" .)