The phrase "a tricky one that" is correct and usable in written English.
It can be used to refer to a particular question, problem, or situation that is difficult or complicated.
Example: "When it comes to solving this puzzle, it's definitely a tricky one that requires careful thought."
Alternatives: "a challenging one that" or "a difficult one that".
His role is a tricky one that could grow annoyingly cute.
Van Gaal expressed his disappointment at the result, labelling his side's performance "average", and is in no doubt the assignment ahead in Germany is a tricky one that will require an improved display.
A hairstylist's job is a tricky one that requires the client's full agreement and compliance to make the experience smooth and happy.
The task proved such a tricky one that in the first blush of the breaking story, some networks, CNN, NBC and CBS among them, overstated the significance of a six-page ruling that proved to be less conclusively damaging legally to Vice President Al Gore's case than was instantly reported.
There are even some really tricky ones that look real, but the card text or name is different than the real ones.
There are a few other juicy tidbits to be found as well — Heins notes that the transition period RIM is currently attempting to wade through has been a tricky one, and that the company (perhaps unsurprisingly) will likely report an operating loss in their forthcoming Q1 earnings report.
Bragg added: "It's a tricky one given that Murdoch is the monster, the current monster, and you can understand why".
It's a tricky one, but that didn't stop astrophotographer Chris Kotsiopoulos from taking up the challenge.
So do you think tourists should spend less time taking photographs and more time enjoying what's around them IRL? Oleg Tolstoy: It's a tricky one, because that is what we've turned out to be, right?
The main thing we can do is support the more measured sources of news available to us; the idea of objective news is a tricky one, but that doesn't mean you can't opt for, say, the more reasonable tone of The New York Times instead of the blabbering of Keith Olbermann or the Wall Street Journal instead of the conspiracy theories of Glenn Beck.
The question of democracy is a tricky one, in fact I think the trickiest one that I deal with in the book.
