The phrase "a justification for this" is correct and usable in written English.
You can use it when you need to explain or provide reasons for a particular action, decision, or statement.
Example: "The committee provided a justification for this decision, outlining the benefits it would bring to the community."
Alternatives: "a rationale for this" or "an explanation for this".
A justification for this might be the only interesting thing she has to say.
And then to recall that any justification for a war has to be a justification for this reality.
'If this document has been used as a justification for this intimidation then we possibly have what some commentators have alleged, namely, a blueprint for a cover-up.
The notion that everyone "has room for improvement" as a justification for this policy reflects a psychological problem that has no place in the classroom.
The essays, written by both chemists and philosophers, adopt distinctive philosophical perspectives on chemistry and collectively offer both a conceptualization of and a justification for this emerging field.
There is never a justification for this type of attack – the attempted murder of a private citizen on the soil of a sovereign nation – and we are outraged that Russia appears to have again engaged in such behaviour.
A high perceptual agreement provided a justification for the use of this group-level indicator in multilevel analysis that took into account the hierarchical structure of these data.
"Sex is the quickest way in which to establish the relationship and provide a justification for the player to pursue this woman," he continues.
And this becomes a justification for the evolution of that ubiquitous behemoth, the modern concert grand.
This provides a justification for the common practice of replacing entrepreneurs with experienced managers as a firm grows.
A good example is the "True Prep Pantheon," which serves up biographies on prep notables ( Tom Wolfe, Michelle Obama and Frank Lloyd Wright among them) that ends up feeling like a justification for revisiting this odd breed ("See, Muffy — we are relevant!").
