Drive away (5)
'drive away' is the definition.
(to repel is to drive away)
This is all the clue.
(Other definitions for repel that I've seen before include "Drive away or disgust" , "Drive back or disgust" , "Sicken" , "Deflect" , "Parry" .)
'drive away' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for dispel that I've seen before include "Cause to vanish" , "Drive away and scatter" , "Make (feeling) disappear" , "Disperse, dissipate" , "Make disappear, doubts perhaps" .)
(Other definitions for oust that I've seen before include "responsible for expulsions" , "Extract" , "Remove from a position of power" , "Turn out" , "Drive out, eject from office" .)