Unnaturally colourful eddy swirling (4)

I believe the answer is:

dyed

'unnaturally colourful' is the definition.

'eddy swirling' is the wordplay.
'swirling' indicates anagramming the letters.
'eddy' is an anagram of 'DYED'.

(Other definitions for dyed that I've seen before include "A shade unnatural" , "Cloth is often" , "not natural?" , "(Of fabric) coloured" , "Changed the colour of fabric" .)

I've seen this clue in The Times.

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