Probably a reference to Clojure's arrow operator:

https://blog.frankel.ch/learning-clojure/2/

Something like a(b(c(d(e(7)))))) in Javascript could be written (-> 7 e d c b a) in Clojure?

Bingo.

Maybe overloadable operators like in C++, where -> usually demotes some kind of deeper access into the object or abstraction? Or, the opposite, and abstracted access.

That is what I thought, but that doesn't make sense for a language without pointers

According to the other comment it seems he meant the |> pipe operator that is under proposal in js