Crossword Genius

Uniquely, commanding officer loudly entered, derisively (10)

Ross

I believe the answer is:

scoffingly

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'derisively' is the definition.
(I know that derisively can be written as scoffingly)

'uniquely commanding officer loudly entered' is the wordplay.
'uniquely' becomes 'singly' (I can't justify this - if you can you should believe this answer much more).
'commanding officer' becomes 'co'.
'loudly' becomes 'ff' (short for fortissimo - 'very loud' in music).
'entered' indicates putting letters inside.
'co'+'ff'='coff'
'singly' enclosing 'coff' is 'SCOFFINGLY'.

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I've seen this clue in the Sydney Morning Herald.
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