Related Clues:

• Lavender's blue, say, where it's protected against frost, say
• Frost, say, checked for 18, say
• It's 'frost' to sound and this you've found!
• Work of poet? Frost, by the sound of it
• ____ or reason
• Traditional children's verse
• Have the same final sound - poetry
• Advertising tune
• Correspond in sound
• Verse for children
• Versification (which goes with reason)
• Catchy advertising tune - Pickwick Papers character
• Catchy tune in advert
• Poem, eg for nursery
• Children's verse