Lunatic inanely curses for nothing (13)
I believe the answer is:
unnecessarily
'for nothing' is the definition.
(for no reason)
'lunatic inanely curses' is the wordplay.
'lunatic' indicates an anagram.
'inanely'+'curses'='inanelycurses'
'inanelycurses' with letters rearranged gives 'UNNECESSARILY'.
I've seen this clue in The Telegraph.
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