The most common and most likely answer to this crossword clue is the 11 letter word LIGHTWEIGHT
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result LIGHTWEIGHT
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The cryptic/wordplay part
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What does LIGHTWEIGHT mean?
LIGHTWEIGHT noun- A particular weight class, or member of such, as prescribed by the rules, between that of the heavier welterweight and the lighter featherweight. See Wikipedia for the specifics of each sport.
- A particular weight category as prescribed by the rules, separate from an open or heavyweight class.
- A competitive weight division as prescribed by the rules, between the heavier middleweight and the lighter featherweight.
- One of little consequence or ability.
- A person who cannot handle their drink; one who gets drunk on very little alcohol.
- A political candidate with little chance of winning
- Lacking in earnestness, ability, or profundity
- Having less than average weight
- Lacking in strength
- Having a small footprint or performance impact