In office again, smirk over application of current journalist (9)
I believe the answer is:
reelected
'in office again' is the definition.
I can't judge whether this defines the answer.
'smirk over application of current journalist' is the wordplay.
'smirk' becomes 'leer' (I've seen this in another clue).
'over' is a reversal indicator.
'application of current' becomes 'ect' (I can't justify this - if you can you should give a lot more credence to this answer).
'journalist' becomes 'ed' (short for editor).
'leer' back-to-front is 'reel'.
'reel'+'ect'+'ed'='REELECTED'
Can you help me to learn more?
(Another definition for reelected that I've seen is " Back in".)