DodgyPutter: The odd thing is although it looks like I can't sell anything else (as it's all equipped) I can click the box to sell my irons. I wondered if it was that there's no paint job replacement at the same level but that seems to be true for other stuff too
I am sure, when you went to the link Sam provided, given what you said, you were not able to click on your driver, putter, etc... and they all said Equiped.
If you edit your clubs first, say replace your driver with the starter driver and then go back to the link, you will be able to sell your driver..it will no longer show as equiped and will be available for sale.
(If I am correct, thats 2 for Nancy Drew)