I don’t know if there is a speciffic Fendi store, but I found that at Paragon you will probably find many designer items, including Fendi.

Here’s what i found on http://www.vcarious.com/Travel-Guide/Asia/Singapore/Shopping.html

“Paragon: Learn to speak Italian: Fendi, Gucci . . . all at Paragon. This shopping mall is very, very upscale, with many elegant stores seeming to sell only a few exquisite items prominently on display in sheer glass cases. ‘Tis fun to see how the other half lives…”

Hope that helps.