Crossword Genius

One doing terribly shows colour (6)

Ross

I believe the answer is:

indigo

'colour' is the definition.
(indigo is a kind of colour)

'one doing terribly' is the wordplay.
'one' becomes 'i' (Roman numeral).
'terribly' indicates an anagram.
'doing' is an anagram of 'ndigo'.
'i'+'ndigo'='INDIGO'

'shows' acts as a link.

(Other definitions for indigo that I've seen before include "Deep-blue dye or colour" , "Violet-blue dye" , "Deep dark blue" , "Violet dye" , "type of dye" .)

I've seen this clue in The Sun.
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