In the [Oxford dictionary website](https://en.oxforddictionaries.com/definition/scissors), the following example for *scissors* is given:

> 
> A small suture scissors was used to "fish" for the deeply embedded
> hair.
> 
> 
> 

However I find weird that it treats *scissors* as singular, being a plural noun. Shouldn't it be *Small suture scissors were used...*?

Why is it correct to treat scissors as singular in that case (assuming it's indeed correct)?

Please note that I'm only interested in the use of the noun *scissors*, the ones that are used to cut, not any other meaning of the word.