25 across
Worthless
sort
of
notepaper
is
stupid
(5-6)
Worthless sort of notepaper is stupid (5-6)
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The definition is at the end of the clue.
How the clue works
Stupid is the definition. EMPTY means 'worthless', and HEADED describes a 'sort of notepaper' (as in headed notepaper), giving EMPTY-HEADED when joined together.