Brilliant long term fix, I like it!
Yes i had a clip spring out once, very close to home thankfully.
issue is once clip comes off, the slave cylinder pops out and dumps fluid as well.
With this in mind, the Volvo oem clip - its not a very good foolproof design actually.
Same goes for simple clip that holds a 240 gearstick in place! Compared to the Supra gearbox gearstick thats held in place by 4 m6 screws, a simple Volvo circlip is pretty dodgy.
Once the external circlip becomes stretched and twisted a bit from previous removal, its a liability.
I bought a new one plus spares from Specialty Fasteners in Canberra. Newer type is better than Volvo circlip as it has more flange material which helps keep clip flat. And make sure the clip groove is clean all the way around.