Another good reason for starting off on a plastic clarinet!
When my son started learning, age 9, we found that if the clarinet was in the case he only practised once a day, as it seemed a big effort to get it out, assemble it, play it, dry it and put it away again. So we left it up on its stand for a lot of the time and discovered that he'd keep picking it up for a 5 or 10 minute play as well as his "proper" practice session. He'd use the pull-through when he'd finished but only disassemble it and dry it properly a couple of times a week. Because it was made of plastic, there was no apparent deterioration, and the joints never got sticky.
I think this really helped him to keep practising, and we continued to leave the clarinet up most of the time until he got his first wooden one after grade 5. By then he was older and had a longer practice session, so we were able to explain that because wood could dry out etc, the new clarinet should always be dried properly and put away after use.
So I do sympathise with your desire to leave the clarinet handy, Sallyanne, but I think Barry and Jon are right to suggest you put it away after each playing session if you want to keep it at its best.