Harmonise colours in riotous decoration (10)

I believe the answer is:

coordinate

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

'harmonise colours' is the definition.
'coordinate' can be an answer for 'harmonise' (thesaurus). I'm not certain of the 'colours' bit.

'riotous decoration' is the wordplay.
'riotous' indicates an anagram.
'decoration' anagrammed gives 'COORDINATE'.

'in' is the link.

Can you help me to learn more?

(Other definitions for coordinate that I've seen before include "Match, harmonise" , "I do not race (anag.)" , "integrate harmoniously" , "correspondent" , "Arrange" .)

I've seen this clue in The Independent.

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