Experimented? You do realise he's played CB all his life? Not to mention when he made his senior debut at CB against Fulham, at the start of last season.
No. This season Clark has started at CB five times (and came on at CB for 80 minutes against Chelsea) and has started at CM four times (coming off the bench against Fulham). Since that Newcastle 'humping', he's started at CB twice (as well as 80 mins against Chelsea game).
Bottom line is this - Clark playing in midfield has nothing at all to do with form or tactics and everything to do with necessity. Villa have four senior CM's missing and he's playing there as an emergency CM. Incidentally this emergency is why Villa are also playing a 4'3' Scottish hobbit and a reserve no-hoper in midfield. And it's why they've signed a geriatric Frenchman with the pace of a tyreless bicycle...
Anyway since his debut at midfield, Reo Coker and Sidwell have both been chosen instead of Clark when fit. Hardly suggests Houllier really thinks he's a viable option beyond a stop gap.
Anyone who's seen him play much would likely agree.His performances at CM have been patchy. His positioning is poor, and he struggles to do just what you suggest he's there to do (break up play). Right now I'm putting this down to inexperience, his postitioning and reading of the game will improve if he's gets more time at CM. And on the plus side, he's very composed on the ball. But his CB performances have been so assured I wouldn't see the point on keeping him there when Villa's midfield returns to fitness.
Things might change. But right now he deserves a call-up based largely on his CB performances which have been far more consistent and impressive imo.
Call me old fashioned but I like to select people on form and merit. If the only argument for playing Clark at midfield is because he can play in midfield then it's hardly worth debating. O'Shea and Killer can play centre mid as well but that doesn't mean they should.