Possible Clues:

• 'No question'
• 'Naturally'
• Assuredly, without doubt
• Naturally, as was to be expected
• Without a doubt, as was to be expected
• Not on the right track, one of the females will get lost, naturally
• It must be remembered from another source
• About a series of lessons, naturally
• Lost without one fellow, needless to say
• See 1 Across