Shut up! I'm embarrassed about Manchester United's leaders (7)

I believe the answer is:

immured

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'shut up' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally mean the same thing.

'i'm embarrassed about manchester united's leaders' is the wordplay.
'embarrassed' becomes 'red' (someone may blush or go red when embarrassed).
'about' says to put letters next to each other.
'leaders' indicates taking the first letters.
The initial letters of 'manchester uniteds' is 'mu'.
'red' after 'mu' is 'mured'.
'im'+'mured'='IMMURED'

Can you help me to learn more?

(Other definitions for immured that I've seen before include "Incarcerated, walled up" , "Enclosed or imprisoned" , "Imprisoned, shut in" , "Incarcerated, put behind bars" , "Locked up in jail" .)

I've seen this clue in The Daily Mail.

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