Push away (5)
'push away' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for repel that I've seen before include "give you the creeps" , "Reject" , "Deflect" , "Drive away like leper" , "Drive or force back" .)
(Other definitions for repulse that I've seen before include "Battlecruiser" , "Cause to feel intense aversion" , "kick in the teeth" , "Ward off" , "Repel" .)