Possible Clues:

• Alternately
• Not European, yet poet comes round at intervals
• One after another's purchase, we hear, acts
• In quick succession
• Still not English that poet pens regularly
• Champ deserves to be heard on and off
• One after another, say, put your teeth into jars
• At intervals one after another
• Champ deserves to be heard on odd occasions?
• In rotation, alternately