Muddled, confused (6)
I believe the answer is:
addled
I believe this clue is a double definition.
'muddled' is the first definition.
(synonyms)
'confused' is the second definition.
(addling is a kind of confusing)
(Other definitions for addled that I've seen before include "Confused (wits); made rotten" , "Gone bad (of eggs)" , "Rotten; muddled" , "became rotten" , "Corrupt" .)