Make sure the account is accurate (5)
I believe the answer is:
audit
'account is accurate' is the definition.
I can't tell whether this definition defines the answer.
'make sure the' is the wordplay.
'make sure' becomes 'audi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'audi'+'t'='AUDIT'
Can you help me to learn more?
(Other definitions for audit that I've seen before include "Financial check" , "assessment" , "Inspection of a company's books" , "Official inspection of company accounts" , "Examination of accounts" .)