Yes, there is a simple way and it doesn't (or shouldn't) affect your coin balance.


1) Backup your wallet if you haven't done so recently. (this is just a precaution and not mandatory)


2) In your Qt wallet, go to Tools -> Wallet Repair


3) Run the Recover Transactions 1 (zapwallettxes=1)


It will now go through your wallet and scrub out the orphan transaction. Should take few minutes.