Laid out advertisement about royal collection (8)
I believe the answer is:
Here is my best explanation:
'laid out' is the definition.
'arranged' can be an answer for 'laid' (arranging is a kind of laying). I am unsure of the 'out' bit.
'advertisement about royal collection' is the wordplay.
'advertisement' becomes 'ad' ('ad' can be a synonym of 'advertisement').
'about' means one lot of letters goes inside another.
'royal' becomes 'r' (abbreviation).
'collection' becomes 'range' (I can't explain this - if you can you should believe this answer much more).
'ad' going around 'rrange' is 'ARRANGED'.
(Other definitions for arranged that I've seen before include "Settled plans for something", "Placed attractively as with flowers", "Put in order or adapted a piece of music", "Put in proper order", "Scored", "Ordered", "Organised, planned" and "Fixed".)