Possible Clues:

• Returns serves
• How the rep. lies and swears around the North for them
• Replies to all four points in a Royal Society brief
• They come in solution
• Not the sort of retorts you'll always find in the laboratory
• In reply, one swears aroud the North (7)
• This does well enough for what one wears around North and south
• As it's about the wrens, that's asking for what you'll get
• The questions get what one wears around the poles
• In reply the swans are all around 'er