Possible Clues:

• Moves fingers across strings
• Plays guitar chords, in a way
• Plays a guitar for drinks on the street
• Plays the banjo, like someone "in the kitchen with Dinah"
• Plays a guitar
• Isn't picky?
• Pulls some strings?
• Toys with strings?
• Plays (guitar) inelegantly
• Plays a zither, say