Curl definers will help, but good conditioners and deep conditioners are better for eliminating frizz and dryness.
ITA with mpgirl, butters and buttery products are wonderful for helping to clump, especially if you use them under a creamy conditioner or leave-in.
I love KCCC
. I use it over leave-ins like Abba Pure Gentle conditioner or Knot Today
(they are alot alike). And under that I have a butter on my wet ends (Qhemet Burdock Root Butter Cream, KBB Hair Cream and Donna Marie Coco Hemp hair butter are all wonderful; and let's not forget Jane Carter Nourish & Shine).
I also use and love Curl Junkie Hibiscus and Banana Deep Fix
. It's a wonderful rinseout conditioner, almost a deep conditioner, and you can leave a little in and see how it totally eliminates frizz.