The phrase "a small sector of" is correct and usable in written English.
It can be used to refer to a specific, limited part of a larger group or area, often in discussions about demographics, markets, or fields of study.
Example: "A small sector of the population is actively engaged in environmental conservation efforts."
Alternatives: "a minor portion of" or "a limited segment of".
Fishing occupies a small sector of the Swedish economy.
Since its inception, the Asian American Hotel Owners Association has been fighting discrimination in many forms from a small sector of competitor hotel owners and managers.
Dr. Ellis said the team, using the same technique in observing a small sector of the sky, had detected two similar objects from the early universe.
Beyond this there is a broader point about the enduring obsession with the IRA of a small sector of England's support.
"A small sector of the community feels that we've got to evaluate people on the basis of what they're doing and what they're delivering.
Although these Iraqis may represent a small sector of opinion -- they fled their country in terror, after all -- the conversations offered powerful clues as to how a war might play out across the wider Arab world.
Our 'natural benevolent affections' guide us to do good toward some small sector of humankind (a small sector composed of our friends, promisees, colleagues, family, etc)., and stifling such natural tendencies would leave only "a very feeble counterpoise to self-love" and thus little from which to develop a more extended and generalized benevolence (434).
There is a small sector and region of wheat production that practices this: mainly North Dakota, small parts of South Dakota, and parts of Canada.
We are so embarrassed, shamed and repulsed by the actions of a small sector, a boisterous mob of boors that will now define us.
Such a seasonal blip in the numbers, in a comparatively small sector of the economy, tells us little about its underlying health.So there is little cause for alarm.
"As a journalist, I am in command of a small sector in the very front trenches of this battle for freedom," Luce once said.
