Career not over for northerner (4)
I believe the answer is:
scot
'northerner' is the definition.
(someone from Scotland)
'career not over' is the wordplay.
'career' becomes 'scoot' (both can mean to move quickly).
'not' indicates named letters should be taken away.
'over' becomes 'o' (cricket abbreviation).
'scoot' with 'o' taken out is 'SCOT'.
'for' acts as a link.
(Other definitions for scot that I've seen before include "Northerner; old tax" , "Eg, a Glaswegian" , "Ancient tax" , "Native of Caledonia" , "Eg Aberdonian" .)