The phrase "a duty like" is correct and usable in written English.
It can be used when comparing a specific duty or responsibility to another duty that is similar in nature or importance.
Example: "He approached his responsibilities with a sense of commitment, treating each task as a duty like that of a soldier in the field."
Alternatives: "a responsibility similar to" or "an obligation akin to".
"So I say, hard work is a duty like prayer.
The mutual-fund industry is a $6 trillion business, and the investigation raises two important questions about how financial firms sell their products.The first of these is whether, in selling a financial product, investment firms have a duty, like doctors and lawyers, to be truly objective in their advice.
They believe that fundamentalist voters were more likely than others to have responded to the calls to vote from supreme leader, Ayatollah Ali Khamenei, who has compared casting a ballot to a religious duty like daily prayers.
It's been much more of a ‑‑ it feels less like a duty and more like a reunion.
Reports abounded of a Call of Duty-like cinematic shooter, set in a ruined city and featuring a rebel faction facing off against the forces of hell, making it sound more like Killzone than "Kill 'em all".
It's an intellectual duty, like cleaning up after your dog.
It's almost a duty if you like – there's an old-fashioned word for you.
NSPCC chief Peter Wanless also said there should be a duty on institutions like hospitals, children's homes and boarding schools to report abuse.
Tamagotchis required children to carry out a duty of care, like Cabbage Patch Kids, but the difference was that the consequences of bad parenting would actually be played out.
Overtime exempt workers must pass a "duties test", like being in charge of two or more full-time employees for a fraction of their work week, or holding a supervisory position.
As I spent long afternoons staring at the ceiling, trying to come up with the fifteen headlines that I needed to send in every week, I hoped that, by calling out all the ridiculous things in this corrupt and fallen world, I was performing a sort of watchdog duty, like an investigative journalist, only with dick jokes.
