I don’t see things he did as clerical. Just because he’s healing someone does not imply it’s clerical stuff.
Now, let’s make a list of wizardry things he does and people tend to forget:
Shaping fluids: he makes the smoke of his pipe take the form of a ship. In the book, it was the elven king and Gandalf who threw water horses against the Narzul, not Arwen, and Gandalf says he only put the horse shapes on the rake.
Summon lightning: as seen against the balrog.
Animalese: he talked to horses, butterflies and eagles throughout the books. Also, he calls Scadufaz whistling a tone that can be heard from miles away.
Long live the wizard: he mentions having lived 300 human lives in TTT.
Celerity 1, Potence 3, Fortitude 2? : for an man as old as he is, he fights well. Too well. He alone is worth 100 soldiers from Minas Tirith. Most humans were fighting the orcs in an equal fight, and they had armor and sharp weapons. Gandalf had a staff and no armor at all, yet he kicked some ass.
Fear me: he looked really cool when he intimidated Frodo in the first movie.
Shiny things: he can cast light with his staff.
Dispel: I think the ‘healing’ of the king was rather a dispelling of Saruman’s magic.
Sleeping with eyes open: I’d like to sleep like that, just for the sake of freaking other people out.
That’s all I can remember, please post more things you people know of.
I think Tolkien envisioned a mage that didn’t use his powers whenever possible because if he did he wouldn’t be such a great character.