Clear the account and leave (6)
I believe the answer is:
acquit
'clear' is the definition.
(I know that clear can be written as acquit)
'account and leave' is the wordplay.
'account' becomes 'ac' (abbreviation for account).
'and' says to put letters next to each other.
'leave' becomes 'quit' (quitting is a kind of leaving).
'ac'+'quit'='ACQUIT'
'the' acts as a link.
(Other definitions for acquit that I've seen before include "Exonerate" , "Release" , "Free (from charge)" , "Clear of a crime" , "Find not guilty" .)