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Writing
this,
hour
wasted
filling
a
puzzle
at
the
beginning
(10)
Writing this, hour wasted filling a puzzle at the beginning (10)
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The definition is at the beginning of the clue.
How the clue works
Writing is the definition here. Take 'this hour' and rearrange it (anagram signalled by 'wasted') to give UTHORSHI, then slot that inside A ('a') followed by P (the beginning of 'puzzle'), so A goes at the front and P at the end wrapping the jumbled letters to spell AUTHORSHIP.