You could probably say the same about Jimmy Greaves or Gary Lineker though - I'd happily take someone like that now (note: I'm not saying that Clarke was anyway close to being as good as those two, but the principle holds)
It may be unknown in football but golfer Jack Niklaus and test cricketer Bhagwath Chandrasekar both had polio as children and went on to successful sporting careers. Kudos for Clarke for doing so - he was good player for the Albion. Not one of the glamour players from those days, but did a job