Possible Clues:

• Number (between zero and nine)
• Finger, e.g.
• Middle finger, e.g.
• See 25-Across
• Really like vermouth? Here's a finger
• One of 101 in a googol
• Finger's breadth as a unit of measurement
• 1, 2 or a finger
• Possibly poke with the thing?
• Some small number really appreciate Information Technology