Retreating grey kangaroos pound continuously (7)
I believe the answer is:
bombard
'pound continuously' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'retreating grey kangaroos' is the wordplay.
'retreating' says the letters should be written backwards.
'grey' becomes 'drab'.
'kangaroos' becomes 'mob' (I can't justify this - if you can you should believe this answer much more).
'drab'+'mob'='drabmob'
'drabmob' reversed gives 'BOMBARD'.
Can you help me to learn more?
(Other definitions for bombard that I've seen before include "Pelt with missiles" , "Batter heavily and persistently" , "Attack with missiles" , "Organ stop" , "not working? Keep hitting" .)