Answer: reddwarf

AnswerCrossword Clue
REDDWARFFor "..." the student wrote "Bashful"...
REDDWARFFaint, low-temperature star
REDDWARFProxima Centauri, for one
REDDWARFRelatively low-temperature star
REDDWARFProxima Centauri, e.g.
REDDWARFBarnard's Star, for one
REDDWARFBashful?