Possible Clues:

• If one looks at the locomotive like this, it will make one tired, you see
• What a gricer does to get it?
• What Mike Smith might have suffered
• It makes one tired when one views the locomotive thus (9)
• What may give blurred sight
• Difficulty for reader, indeed, in English school
• The visionary effect of key positive coaches
• Vision problem
• Looks at tutor, which causes physical discomfort
• A serenity leading to ocular stress