The phrase "little citrus" refers to small fruits that belong to the citrus family, like oranges or lemons. It is used to describe small-sized citrus fruits. Full definition
I have a nifty little citrus juicer (the best $ 9 I ever spent!) (yupitsvegan.com)
These tart - sweet - zesty little citrus confections look like summertime delights! (homespuncapers.com)
These little citrus - scented cakes cook in just 10 minutes, which means that if you prepare the batter ahead of time and bake them right after the table is cleared, you can serve them warm for an extra-special touch. (epicurious.com)