Crossword Genius

Where the charge reposes if we are involved (4)

Ross

I believe the answer is:

onus

I'm a little stuck... Click here to teach me more about this clue!

'where the charge reposes' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'we are involved' 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...

'if' acts as a link.

Can you help me to learn more?

(Other definitions for onus that I've seen before include "Capulet opponent (R&J)" , "Obligation - charge" , "albatross?" , "Responsibilty" , "'Responsibility, task or burden (4)'" .)

I've seen this clue in The Irish News.
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