Listen out and enrol (6)
I believe the answer is:
enlist
'enrol' is the definition.
(enlisting is a kind of enrolling)
'listen out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'listen' anagrammed gives 'ENLIST'.
'and' acts as a link.
(Other definitions for enlist that I've seen before include "Join the armed forces" , "Draft" , "Enrol - recruit" , "Join the armed services" , "Join the military" .)