Drive away when some of the male personnel turned up (5)
I believe the answer is:
repel
'drive away' is the definition.
(to repel is to drive away)
'some of the male personnel turned up' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'turned up' shows that the letters should be reversed in order.
'leper' is hidden in the letters of 'male personnel'.
'leper' back-to-front is 'REPEL'.
'when' acts as a link.
(Other definitions for repel that I've seen before include "Drive back like leper" , "Deflect" , "oppose" , "Drive back or ward off" , "Successfully resist" .)