Possible Clues:

• Such a line to guide, possibly, round pole?
• A Morse foot
• Its lines run between poles
• Part of position taken up by Miss Sobel
• Length is almost noisier without northern fool
• No degrees in this can get you into the Royal Observatory
• At length it could become due to a certain degree
• Writer of some mettle, it may be said
• Not, in short, is it due for navigation
• Covering golf, broadcast outlined distance, one way or another