Contract to get hornets out (7)
I believe the answer is:
shorten
'contract' is the definition.
(I know that contract can be written as shorten)
'hornets out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'hornets' anagrammed gives 'SHORTEN'.
'to get' is the link.
(Other definitions for shorten that I've seen before include "Abridge" , "Cut back" , "Clip" , "Put extra fat" , "Abbreviate" .)