The goose's conceit (3)

I believe the answer is:

ego

I'm a little stuck... Click here to teach me more about this clue!

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

'the goose's' is the wordplay.
'EGO' is hidden in amongst the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for ego that I've seen before include "See 21 Down" , "One's self-image" , "Inner self" , "Person's sense of self" , "Self-esteem or self-importance" .)

I've seen this clue in The Mirror.

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