Mix-up where the one in the middle was replaced by second auctioneer (6)

I believe the answer is:

muddle

I'm a little stuck... Click here to teach me more about this clue!

'mix-up' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for muddle that I've seen before include "Confused mess" , "Confused state" , "[OPPOSITE OF] clear" , "disorderly state of affairs" , "Confusion - mess" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app