11 down
US
tint
–
a
measure
of
rank
for
one
from
Aspen
or
Boulder
(9)
US tint – a measure of rank for one from Aspen or Boulder (9)
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The definition is at the end of the clue.
How the clue works
See the end there, one from Aspen or Boulder — that's your definition, a resident of Colorado. For the wordplay, start with COLOR, the US spelling of "tint", then just tack on A, then DAN, that martial arts rank you get promoted through — COLOR plus A plus DAN gives you the answer.