Can I accept an offer if there is already a bid in

[TomYumSoup]

I suspect the answer is no but hope you don't mind me asking to check. I didn't list as best offer accepted or anything. TIA

I listed as auction but someone has made an offer that I would accept

No unless the offer is from the person who has bid. In theory you could end the auction and re list as a bin but this is not the nicest thing to do and I think you would get a defect too. Just let it run - you might end up with more anyway.