Possible Clues:

• Clipper of the line
• Sheet anchor?
• It's responsible for a holdup online
• He is to begin proceedings, say, after idiot found on line
• It may be responsible for a hold-up on the line
• Device to clip laundry to line
• He fools around with power, say, for online device
• Stage performer taking lace finally through shoe fastener
• Fastener for washing line
• On-line clip showing oddly callow actor, say