Possible Clues:

• ' neighbor
• Button usually hit with the right pinkie ... or a hint to solving 1-Across?
• What's keen yet wavering operator finally pressed?
• ATM feature
• Pressing it is often the same as clicking the “OK” button
• Long bar on a computer
• It'll give you a break
• Put in something that's vital? Now you depress me!
• Shift neighbor
• Pinkie target, at times