Related Clues:

• The witch might cast the letters thus
• One's supporter for a very short time
• This may be cast, but not by the fisherman
• Even less than 9 across, and that's tiny, and not for the first time, either
• Supporter shortly, but not in the first place
• Less than a minute bit less than the first
• One gives support, but only for a short time
• A matter of letter to be cast for magic
• Even smaller than minute, but not the first (6)
• 'Very little, and not for the first time (6)'
• Magic incantation
• Get the letters cast
• With 16-Across, infield position
• Back a bit
• Support at the meeting