The Crossword Centre Clue-Writing Competition

CCCWC February competition voters’ comments
 
Clue no. 47: Staves headless Celt off inside Slough (8)

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A clue to WETLANDS.
2 comments refer to this clue (from 2 competitors, 0 others)

Here is the text

Comments on the clue
1.But what does it mean?
2.Off serves no use in clue other than to add to surface reading?