Note Russian fighter is on speed in Settle again (9)

'settle again' is the definition.
(settle in a different country)

'note russian fighter is on speed' is the wordplay.
'note' becomes 're' (as in do-re-mi).
'russian fighter' becomes 'MiG' (Russian fighter plane manufacturer).
'is on' is a charade indicator (letters next to each other).
'speed' becomes 'rate' (the speed at which something happens).
're'+'mig'+'rate'='REMIGRATE'

'in' acts as a link.