The phrase "address only a fraction" is correct and usable in written English.
It can be used when discussing a situation where only a small part of a larger issue or topic is being dealt with or considered.
Example: "The report will address only a fraction of the environmental concerns raised during the meeting."
Alternatives: "cover just a portion" or "tackle merely a segment".
In the present study we have addressed only a tiny fraction of the data produced to date and perhaps raised the question that focusing on one cell line for a single nuclear receptor, such as hPXR, may be too simplistic.
Because registering with the Iraqi Ministry of Displacement and Migration is a difficult process that requires going to Baghdad and presenting several documents that prove former address and family size, only a fraction of those displaced register, according to officials at humanitarian agencies.
Initiatives by governments are in most cases political and address the needs of only a fraction of the population.
Although the chicken genome has been sequenced, one-dimensional sequencing information can only address a fraction of the relevant biological questions [ 15].
But on the other hand, once we contend effectively with the fact that we eat way too many calories, that "junk" is perceived as a legitimate food group, and that we spend egregiously too much time on our backsides rather than our feet -- we might reasonably address only the remaining fraction of the obesity epidemic with other considerations.
Second, and what most people don't actually address often, is that the amount dispersed is sadly only a fraction of what Haiti needs.
If only a fraction of the energy devoted to shutting up women was instead channelled into finding constructive ways to address the problems they're attempting to highlight".
But the site has not been independently audited and only a fraction of users pay the annual £5 registration fee that gives access to the email addresses of others.
Only a fraction were Italian.
