Qualification is incomplete, elite dancer miserable (10)

I believe the answer is:

credential

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'qualification' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for credential that I've seen before include "proof of entitlement" , "Qualification (indicating a person's suitability)" , "Official introductory letter" , "Interlaced (anag.)" .)

I've seen this clue in The Guardian.

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