Part — with ease, if broken? (8)
I believe the answer is:
separate
'part' is the definition.
(synonyms)
'ease if broken?' is the wordplay.
I cannot really understand how this works, but
'broken?' could be 'ate' (eating is a kind of breaking) and 'ate' is present in the answer.
This explanation may well be incorrect...
'with' acts as a link.
(Other definitions for separate that I've seen before include "Take or keep apart" , "Dinstinct or discrete" , "Unconnected" , "divorce" , "Break up" .)