Dumps like that covered in black containers (9)
I believe the answer is:
jettisons
'dumps' is the definition.
(to jettison is to dump something out of a ship)
'like that covered in black containers' is the wordplay.
'like that' becomes 'so' (as in 'like so').
'covered in' means one lot of letters goes inside another.
'black' becomes 'jet' (similar in meaning).
'containers' becomes 'tins' (tin is a kind of container).
'jet'+'tins'='jettins'
'so' inserted within 'jettins' is 'JETTISONS'.
(Other definitions for jettisons that I've seen before include "Throws overboard to lighten ship" , "Throws goods overboard, discards" , "Discards unwanted material as from sinking vessel" , "Throws from a ship or aircraft" .)