Do cuttings (clones) need nitrogen while rooting?

Clones don't need any nutrients to root. Their lower fan leaves will yellow and die as the clones feed on them to grow roots.
 
A good way to feed clones is foliar spraying a very light nute solution. But as was already stated, some yellowing is expected. Perhaps you need to dim your lighting.
 
couple drops of vitamin b1 aka phosphoric acid 0-2-0

YES someone else said to have as little light as possible when cloning which makes sense to slow down metabolism

its a single blue spctrum 13w CFL but its still bright.

ty.
 
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