The victor has to expel (5)
I believe the answer is:
evict
'expel' is the definition.
(I know that evict is a more specific form of boot out)
'the victor has' is the wordplay.
'has' says the answer is hidden in the clue.
'EVICT' is hidden in the letters of 'the victor'.
'to' acts as a link.
(Other definitions for evict that I've seen before include "Put out of house as for non-payment" , "Expel from home" , "Remove form house for non-payment" , "Turn out (of property)" , "Force to move out" .)