Manage a new record outside and leave (3,5)
I believe the answer is:
run along
'leave' is the definition.
(I've seen this before)
'manage a new record outside' is the wordplay.
'manage' becomes 'run' (I've seen this before**).
'new' becomes 'n'.
'record' becomes 'log' (logging is a kind of recording).
'outside' means one lot of letters goes inside another.
'n' placed inside 'log' is 'long'.
'run'+'a'+'long'='RUN ALONG'
'and' acts as a link.
(Other definitions for run along that I've seen before include "Go away!" , "Imperative for leaving" , "Informally leave or depart - on the trot?" .)