Crossword Genius

A loud cuckoo flying over new dump (6)

Ross

I believe the answer is:

unload

I'm a little stuck... Click here to teach me more about this clue!

'dump' is the definition.
(thesaurus)

'a loud cuckoo flying over new' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'over' could be 'o' (cricket abbreviation) and 'o' is located in the answer.
'new' could be 'n' and 'n' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for unload that I've seen before include "Get rid" , "Remove cargo from ship or goods from lorry" , "Remove cargo from ship or charge from gun" , "Discharge cargo" , "Remove (a gun's ammo)" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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