Like a fish eating object with derision (10)
I believe the answer is:
scathingly
'with derision' is the definition.
'like a fish eating object' is the wordplay.
'like a fish' becomes 'scaly' (fish have scales).
'eating' means one lot of letters goes inside another.
'object' becomes 'thing'.
'scaly' enclosing 'thing' is 'SCATHINGLY'.
I've seen this clue in The Guardian.
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