First the 'dimensions' of strategic clarity.
Simple. Every single member of the workforce, from the very top to the very bottom of the org chart needs to be able to repeat the strategy with 'clarity'. In one sentence at most.
Here are some examples.
Microsoft the startup: 'A PC on every desktop'.
Apple the growth company: Macs are 'insanely great'.
Sun the growth company: The network is the computer.
In brief, the strategic clarity can be summed up in a mass tagline.
Now for your first question.
Strategic clarity is the embrace of the company's execution agenda by both the formal and informal culture of the enterprise........ at every stage of its evolution.
For right or wrong, Ballmer's One Microsoft internal memo is an example of strategic clarity in recent times.