Nothing observed in outrageous clue, USA detective having no competence (8)

I believe the answer is:

clouseau

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'detective having no competence' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'nothing observed in outrageous clue usa' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'observed in' indicates putting letters inside.
'outrageous' is an anagram indicator (an outrageous spelling).
'clue'+'usa'='clueusa'
'clueusa' anagrammed gives 'cluseau'.
'o' put into 'cluseau' is 'CLOUSEAU'.

Can you help me to learn more?

(Other definitions for clouseau that I've seen before include "I'm no match for Morse" , "Peter Sellers' Pink Panther inspector" , "useless detective" .)

I've seen this clue in The Independent.

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