The 4 letters I have come from, in order:-
Out of order, do crime (taking drug): that's not very good.... (8)
= Mediocre
...comparatively good is one who backs prediction with money (6)
= Better
Old man batting is suffering... (4)
= Pain
...for the same length of time, provided... (2,4,2)
= As long as
4th letter of each.