Responsibility we must shoulder? (4)
I believe the answer is:
onus
'responsibility' is the definition.
(onus is a duty or responsibility)
'we must shoulder?' is the wordplay.
I cannot quite understand how this works, but
'we' could be 'us' and 'us' is present in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for onus that I've seen before include "Burden, duty" , "Responsibilty" , "Weight of responsibility" , "'Burden, load (4)'" , "'Burden, of proof (4)'" .)