Does the job application suggest you need to be a “recent graduate”? If so....
I don’t agree with the term but a recent graduate to me is someone who graduated in the last 18 months (maybe 24 months at a push). But it’s one of those definitions that is up for debate - seen some employers deem recent as graduated in the last 12 months. But that would be someone who is a “recent” PG grad as much as a UG grad.
Any job is not a position of responsibility - it is work experience. But if you have had additional responsibility in that job then explain that. By that I mean things like mentoring, CSR initiatives, being involved in volunteering/fund raising, or getting involved in work outside of your jobs remit (and by that I mean things like helping with graduate Recruitment - attending fairs, interviewing, helping out with their events etc - although could be other departments like Marketing CSR).
I wouldn’t personally focus on things you did 6-7+ years ago. You probably have a lot more recent experience that shows off your skill set better. It’s not that you should explain your first year ECs, just don’t waste word count on describing them.
Based on the above, do you have any ECs / PoR from the last 3-4 years (eg while working or during your masters).?