MacGregor's sense of self (3)

I believe the answer is:

ego

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

'sense of self' is the definition.
(psychological term for one's inner self)

'macgregor's' is the wordplay.
'EGO' is hidden in amongst the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for ego that I've seen before include "Personal pride" , "Part of the mind" , "One's self image" , "Self-confidence" , "Morale" .)

I've seen this clue in The Sun.

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