Setter's dropping weight initially, so I hope that's shifted (8)

I believe the answer is:

whoopsie

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'setter's dropping' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'weight initially so i hope that's shifted' is the wordplay.
'initially' says to take the initial letters.
'that's shifted' indicates anagramming the letters.
The first letter of 'weight' is 'w'.
'so'+'i'+'hope'='soihope'
'soihope' with letters rearranged gives 'hoopsie'.
'w'+'hoopsie'='WHOOPSIE'

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I've seen this clue in The Guardian.

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