Possible Clues:

• No driver to do the placing, perhaps
• Green tool
• The cause for wearing of the green
• Provider of little strokes
• Car park sign, say, placed behind golf club
• Idle, with 'around'
• To go on strike over the green of course
• Only one club in your hand if it's green
• You'd never take one for a drive
• Perhaps one that does the placing on green