Roy Rogers's favorite digit?

• A gunslinger may have an itchy one
• Gunslinger would have this tense boatyard worker provided with a measure of alcohol
• 31-Across activator

Wikipedia Word definitions in Wikipedia
Triggerfinger is a 2013 song by Norwegian pop band Donkeyboy featuring uncredited vocals from Canadian musician Kiesza . It was released in Norway on August 23, 2013. The song peaked at number 9 on the Finnish Singles Chart .