Lest we forget that practicing isn't all about the clarinet, A.I.R. is also a convenient way to remember this wisdom:
A: Action. You can probably rattle off your practice routine - it's full of actions specific to one aspect of clarinet playing. Long tones, scales, articulation studies, and so on. That's great as long as you are aware of the main purpose of each action. Long tones for consistency of tone, scales for evenness of finger, or articulation for ease of the tongue stroke, for example.
I: Integration. Now, all that doesn't matter if you don't PLUG IT IN, integrate it, put it into context. You finish with your warm up or drills, and move on to etudes, pieces or excerpts, and whooooosh, out the window all those good habits go! Nope. Integrate what you just did in the previous action.
R. Release. Finally, you have to release and rest. Woodshedding a passage over and over isn't going to make it better. Give your muscles a break, and let your mind relax. This keeps everything from over-tightening and over-tensing!