Answer: sitinon

AnswerCrossword Clue
SITINON

Audit, as a class

SITINON

Audit, as a college course

SITINON

Audit

SITINON
Attend.
SITINON
Join, as a meeting
SITINONAudit a course
SITINONAttend as a visitor
SITINONTake for no credit