Leave in rush, holding record (6)
I believe the answer is:
depart
'leave' is the definition.
('depart' can be a synonym of 'leave')
'rush holding record' is the wordplay.
'rush' becomes 'dart' (darting is a kind of rushing**).
'holding' means one lot of letters goes inside another.
'record' becomes 'ep'.
'dart' placed around 'ep' is 'DEPART'.
'in' is the link.
(Other definitions for depart that I've seen before include "Retire from" , "Petard (anag.)" , "Make an exit" , "make tracks" , "Leave, vanish" .)