Posted: 08/12/2016 at 14:00
that looks like a privet to me, at least the 2nd photo does. If it is it won't get fireblight which only affects some of the Rosaceae family.
I'd have a look and see if it's all one branch off the main stem and if that branch has been damaged in some way.
You can see from pic 3 that there is a certain amount of dead stuff and the sooner you remove that, the sooner the rest will fill in the gap. Take it well back to live growth to remove any source of infection if there is one.
Tight clipping is quite hard on a plant, all the new fresh growth gets chopped off and it's left with the old bits