> Can a 'clock' function be included in a '#declare' line?

Yes...

> Is there a way to look at the output of a POV calculation. For instance, an
> easy way to show it on the output screen?

  #declare i = 1.234;
  #debug concat("i = ", str(i, 0, -1), "\n")

For a vector you could use a macro like this:

  #macro VectorString(P, Precision)
    concat("<",
      str(P.x, 0, Precision),
      ", ",
      str(P.y, 0, Precision),
      ", ",
      str(P.z, 0, Precision),
      ">")
  #end

  ...

  #declare V = <1,2,3>
  #debug concat("V = ", VectorString(V, -1), "\n")

See "String Functions" and "Text Message Streams" of the POV-Ray 
documentation.

Bye,
Friedemann

-- 
Friedemann Schmidt
F.S### [at] fhtw-berlinde
Raytracing-Gallery: http://home.fhtw-berlin.de/~s0049669/
TextureView: http://home.fhtw-berlin.de/~s0049669/software.html

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