Those providing cover for the King and Queen of Belgium showing off Linden

I believe the answer is:

bed linen

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

'those providing cover for the king and queen' is the definition.
I can't tell whether this definition defines the answer.

'belgium showing off linden' is the wordplay.
'belgium showing' becomes 'be' (I can't explain this - if you can you should believe this answer much more).
'off' indicates an anagram.
'linden' is an anagram of 'dlinen'.
'be'+'dlinen'='BED-LINEN'

'of' is the link.

Can you help me to learn more?

(Other definitions for bed linen that I've seen before include "folded sheets?" , "Sheets, pillowcases and duvet covers" , "Sheets and pillowcases, primarily" , "Sheets, pillowcases, etc." , "Sheets, pillow cases etc" .)

I've seen this clue in the Irish Times.

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