Narcissism, for example, is linked to leaderless state of the EU (8)

I believe the answer is:

egomania

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'narcissism' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for egomania that I've seen before include "Obsessive self-absorption" , "Excessive self-centredness" , "Obsessive self-conceit" , "Obsessive regard for oneself" , "Obsessive self-interest" .)

I've seen this clue in The Guardian.

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