Clue: Better current politician cycling past (7)
Answer: IMPROVE
Explanation: Better current politician cycling past (7)
I (unit of electric "current") + M.P. + ROVE ("cycling" OVER) 
To get the "cycling over" bit, imagine the word OVER written on a wheel, then "cycle" it by 90 degrees, the letters would then spell OVER if you started at the same place.