The phrase "a larger question about" is correct and usable in written English.
You can use it when introducing a broader topic or issue that extends beyond the immediate subject being discussed.
Example: "While we can debate the specifics of this policy, it raises a larger question about the role of government in our lives."
Alternatives: "a broader issue regarding" or "a more significant inquiry into".
The downward trend raises a larger question about the show's future after this season.
The incident raised a larger question about the invasion of Iraq: why was speed so important?
Munro's work has always posed a larger question about reputation itself; about how we break and remake the literary canon.
The issue of leaving early often leads to a larger question about the dedication of the Yankees' fans, and of New York sports fans in general.
But all of this talk about the pressure on coaches raises a larger question about the role they play in creating their own predicament.
This would lead into a larger question about your relationship with water bodies generally: you are from Karachi, which is, as you say, the city by the sea.
Beyond the moral problem of stealing someone else's ideas without attribution, at least in academe plagiarism also raises a large question about whether the student who plagiarizes actually learned the material.
And there's a larger question, too, about whether the Tea Party (which, polls show, has a large constituency of religious conservatives) will turn to social issues, from which it has mostly shied away.
Given the continuing concerns about costs and the burden that often falls to taxpayers, a larger question has emerged about whether the modern Olympics should continue to crisscross the globe as the multibillion-dollar lottery ticket it has become.
The empire There is a larger question to ask, however, about the very existence of the Mecom empire, which acquired publishing groups in Germany, Norway, Denmark, Poland and the Netherlands.
A larger question, she wrote, "is about corporate governance, the fiduciary responsibility of not-for-profit boards, and the steps individuals will take to block transparency in an effort to protect their self-interest".
