Sausage not entirely uniform sounded most unsatisfactory (10)
I believe the answer is:
liverwurst
'sausage' is the definition.
(I know that liverwurst is a type of sausage)
'not entirely uniform sounded most unsatisfactory' is the wordplay.
'not entirely' means to remove the last letter (not all of the word).
'uniform' becomes 'livery' (livery is a type of formal uniform).
'sounded' shows a homophone (sound like).
'most unsatisfactory' becomes 'worst' (I've seen this in another clue).
'worst' sounds like 'wurst'.
'livery' with its last letter taken off is 'liver'.
'liver'+'wurst'='LIVERWURST'
(Another definition for liverwurst that I've seen is " Sausage".)