Related Clues:

• Once in a long while
• Alluvium
• Rarely, not often
• Not often, infrequently
• Not very often, rarely
• Not often, rarely
• Not often, seldom
• Hardly ever, most infrequently
• Not very often, seldom in fact
• Seldom, not frequently
• Might the artist depend on this? Just now and then
• How one model's not of ten, perhaps
• The artist seldom has to depend on this
• The artist might depend on this, but not often (6)
• Ungrammatically sold them, by the sound of it, not 15 across