Possible Clues:

• Studier of signs
• A street sweeper ultimately with job taking in old, great river is predictably a harbinger of things to come
• One makes a fortune out of the heavens
• One predicting exciting future perhaps, right after great solo plays
• Roger's a lot to chew over - he's a stargazer
• One who reads the stars
• Horoscope producer
• Horoscope Writer
• One interpreting the stars' movement
• One having star go with role that's fanciful?