I just checked my air filter and found the hose quite difficult to get off. Like others I found that if you release the 3 clips first and make sure that the hose clamp is loose enough to slide to the bellows, you can work the hose off.
I found that get it on, I had to first slide the cover into the rear slots and then hold the front as high as the body metal would allow and then I could work the hose back on. Not any real room to spare, but it wasn't that bad. Fortunately the 3rd clip, which is under the hose goes on easily.