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Lacking individuality, unlike Hamlet for example (13)

Ross

I believe the answer is:

characterless

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'lacking' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for characterless that I've seen before include "Lacking distinctive qualities" , "Dull" , "Lacking a distinctive nature" , "Nondescript" .)

I've seen this clue in The Times.
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