Drop item put out in readiness (11)
I believe the answer is:
promptitude
'readiness' is the definition.
(thesaurus)
'drop item put out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'drop'+'item'+'put'='dropitemput'
'dropitemput' is an anagram of 'PROMPTITUDE'.
'in' is the link.
(Other definitions for promptitude that I've seen before include "Detroit pump (anag) - readiness to act" , "Quickness of action; readiness" .)