Sacked? Is Pellegrini about to drive away? (6)
I believe the answer is:
dispel
'drive away?' is the definition.
('dispel' can be a synonym of 'drive away')
'sacked? is pellegrini about' is the wordplay.
'about' says the answer is hidden in the clue.
'DISPEL' is hidden in the letters of 'sacked is pellegrini'.
'to' acts as a link.
(Other definitions for dispel that I've seen before include "Make disappear, doubts perhaps" , "'Disperse, clear away (6)'" , "Blow away, scatter" , "Clear, blow, away" , "Banish, drive away" .)