Related Clues:
- It grows down as it grows up
- H. L. Mencken as Herb in Maryland
- With one pondering serious matters there's no time for theatre
- Source of down clue I derived in part
- Greenhouse gas ultimately built up in plant
- GRAYISH GREEN
- Insightful one
- Duck behind deer every now and again
- Savant
- ie Red (anag.)
- Cover drops down for a duck
- Learned following second time
- With time son will become wise man
- Cardinal that's up and down, for example
- Duck 'one ding or dee udder'!