Check the books, otherwise, get the examiner (7)
I believe the answer is:
auditor
'the examiner' is the definition.
(an auditor examines accounts etc)
'check the books otherwise' is the wordplay.
'check the books' becomes 'audit' (I've seen this in another clue).
'otherwise' becomes 'or'.
'audit'+'or'='AUDITOR'
'get' is the link.
(Other definitions for auditor that I've seen before include "One who hears can check the books" , "He checks the account books annually" , "Listener; checker" , "One reviewing books" , "Financial checker" .)