Member Sun's boss protected? (8)

I believe the answer is:

armoured

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'protected?' is the definition.
(I've seen this before)

'member sun's boss' is the wordplay.
'member' becomes 'arm' (member can mean a limb).
'sun's' becomes 'our' (I can't justify this - if you can you should believe this answer much more).
'boss' becomes 'ed' (short for editor - newspaper boss).
'arm'+'our'+'ed'='ARMOURED'

Can you help me to learn more?

(Other definitions for armoured that I've seen before include "Protectively covered" , "Protected from weapons" , "Having protective covering" , "protected against attack?" , "bullet-proof?" .)

I've seen this clue in The Sun.

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