Delete field from raw_user_meta_data

I'm sending a value form the client in 'organisation_id' & reading it in a function, once I have read it I'm saving it using a custom claim package but how do i then delete that value after I have done that?

I read it like this inside my trigger function, how would I delete it here too ?:
new.raw_user_meta_data->>'organisation_id'
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