Top ten perhaps, the ones to be done away with? (3,4)
I believe the answer is:
hit list
I believe this clue is a double definition.
'top ten' is the first definition.
(I've seen this before)
'the ones to be done away with?' is the second definition.
(people to be assassinated)
'perhaps' acts as a link.
(Other definitions for hit list that I've seen before include "it's best not to be on it" , "potential victims?" , "Successes in the music industry" , "Assassin's agenda" , "Assassin's potential workload?" .)