I have developed a soft spot for Clancy's, my partner and I often choose to go there over a sit-in place.
Lovely staff selling wonderful vegan food at excellent prices (seriously - they do a delicious veggie burger of the day with a good quality bun and homemade relish for only about £2.30) - who could say no??
As well as takeaway snacks and treats you can also get cooking ingredients, some of which look quite exotic and unusual.
I think their offerings change slightly from day to day so there's no guarantee that what you had one time will be there the next time - but you probably won't care because there's so much to choose from and it all looks delicious!
If you're hung up about the lack of seating then there are benches outside the market where we usually go, it's nice to sit in the sun! (though don't count on the sun actually being out because this is Wales)