Related Clues:

• Use a cupel
• Dreaded class word
• Endeavor
• Undertake
• Step in getting a license
• Final, perhaps
• Pro or con follower
• It makes the grade
• Give it a go
• Word with litmus or taste
• Try out
• Makeup, e.g.
• See 18-Across
• Do one's best
• Sound engineer's word