Crossword Genius

Order outline maps in decorative cover (8,5)

Ross

I believe the answer is:

emulsion paint

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

'decorative cover' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'order outline maps in' is the wordplay.
'order' indicates an anagram.
'outline'+'maps'+'in'='outlinemapsin'
'outlinemapsin' is an anagram of 'EMULSION PAINT'.

Can you help me to learn more?

(Other definitions for emulsion paint that I've seen before include "Type of wall covering" , "Wall-covering perhaps" .)

I've seen this clue in The Independent.
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