The most common and most likely answer to this crossword clue is the 10 letter word DEADWEIGHT
I've seen this crossword clue in The Guardian
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More clues leading to the result DEADWEIGHT
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DEADWEIGHT mean?
DEADWEIGHT noun- Unremitting heavy weight that does not move.
- The largest weight of cargo a ship is able to carry; i.e, the weight of a ship when fully loaded minus its weight when empty.
- Dead load.
- That which is useless or excess; that which slows something down.