Related Clues:

• It's penned in potassium on paper
• The sort of ling one may write a hint with
• Perhaps penny liquid
• Over the ling would be just a hint all right, by the sound of it
• Fifty such might be part of a chain
• 'That's a bit of all right, by the sound of it (3)'
• 'For the writer, such ling gives an idea (3)'
• The South would make this go down in writing
• 'The South would go down with this all right, by the sound of it (3)'
• 'It's not all right these days, by the sound of it (3)'
• Double you with this gets close to one eye for writing
• Could this sort of ling give one a suggestion?
• Scams half of 24-across
• Contents of some wells
• Fountain-pen filler