With respect, they’re off (4)
I believe the answer is:
hats
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for hats that I've seen before include "Headdresses" , "Headwear" , ""Porkpie" and "pillbox" attire" , "Headgear" , "Milliner's stock" .)