Shaved king, going grey, seeing red! (7)

I believe the answer is:

enraged

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

'shaved king going grey' is the wordplay.
'shaved' says to take the centre.
'king' becomes 'henry' (I've seen this before).
'going grey' becomes 'aged' (I can't justify this - if you can you should believe this answer much more).
The middle letters of 'henry' are 'enr'.
'enr'+'aged'='ENRAGED'

Can you help me to learn more?

(Other definitions for enraged that I've seen before include "Irate" , "on the warpath?" , "Wild" , "Infuriated, made mad" , "Made very angry" .)

I've seen this clue in The Telegraph.

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