The phrase "an ancillary issue" is correct and usable in written English.
It can be used to refer to a secondary or supplementary matter that is related to a primary topic or concern.
Example: "While the main focus of the meeting was the budget, we also discussed an ancillary issue regarding employee benefits."
Alternatives: "a secondary issue" or "a supplementary matter".
Across the board, Baltimore's depth is a little meeker than usual, but that's an ancillary issue.
Yet for many in Santa Fe, that came to be seen as an ancillary issue, one that inevitably led to fruitless discussions in which opposing sides cited conflicting studies or anecdotal evidence.
That exchange shouldn't take long, but the union gave the league an ancillary issue to ponder yesterday, announcing that an overwhelming majority of players in the N.B.A. women's league have agreed to form a union and have the National Basketball Players Association as their collective bargaining representative.
Transforming it from an ancillary issue siloed in some distant corner of the enterprise to a broad core competency requires significant and sustained effort.
This violence is not just an ancillary issue that affects "those" people, and it definitely doesn't increase our safety.
Just recently we even reaped an ancillary payoff.
Fortis is an ancillary effect, a one-time thing.
After a flurry of deal-making over a two-day span, the N.F.L. is on the verge of a new labor agreement with its players, with just a few ancillary issues left to be settled, a person briefed on the negotiations said Friday.
"This generation understands much better than those that have gone before, including ours, that this is not just some ancillary issue," she said.
Hard to cut through the resistance here, never mind allowing our children to express their sexuality at home, which brings up the ancillary issue of letting the parents of our teen's boyfriend or girlfriend know what's going on behind closed doors.
In his absence, the two sides reported significant progress on a number of ancillary issues.
