Now what is a wire retainer? (Wire retainer is also sometimes described as “lead retainer” – not that that explains what it is!) Well, first of all — wire retainer is a darn cool feature!
But before I go into that, let me just say that I, like so many people, am a big fan of Xuron. If you look on Amazon reviews, you will find that almost invariably, Xuron products get a very high rating. Deservedly so. I have slowly accumulated some Xuron pliers and cutters. Not one has been disappointing.

Xuron Oval Head Micro-Shear Flush Cutter with Wire Retainer (Xuron 9100F)

I really needed (wanted?) a durable, quality flush cutter. And as I am such a fan of Xuron, I researched this model and it was all go-go-go!
According to the Manufacturer’s Description:
(bolded text is mine)
What is the Wire Retainer
The wire retainer on the cutter helps the plier hold onto the cut wire so that it does not spring away. It is very cool.

This video below (from Xuron) succinctly demonstrates the flush cutter wire retainer feature.
Would I recommend a Xuron tool? Without a doubt.