Approaching rogue in anger (7)
I believe the answer is:
nearing
'approaching' is the definition.
('near' can be a synonym of 'approach')
'rogue in anger' is the wordplay.
'rogue' indicates anagramming the letters.
'in'+'anger'='inanger'
'inanger' with letters rearranged gives 'NEARING'.
(Other definitions for nearing that I've seen before include "Moving towards" , "Drawing closer to" , "Getting close to" , "Approaching" .)