Lone duck out in the open (8)
I believe the answer is:
unlocked
'open' is the definition.
(similar in meaning)
'lone duck out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'lone'+'duck'='loneduck'
'loneduck' is an anagram of 'UNLOCKED'.
'in the' acts as a link.
(Other definitions for unlocked that I've seen before include "made widely available" , "Not fastened" .)