Gregory is seen to be so self-centred (10)

I believe the answer is:

egocentric

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'self-centred' is the definition.
('egocentric' can be a synonym of 'self-centred')

I cannot understand how the remainder of the clue works.

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(Other definitions for egocentric that I've seen before include "Self-absorbed" , "Self-seeking" , "Self-interested" , "Selfish" , "Self-centred person with little regard for others" .)

I've seen this clue in The Telegraph.

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