Crossword Genius

One doing badly shows colour (6)

Ross

I believe the answer is:

indigo

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

'one doing badly' is the wordplay.
'one' becomes 'i' (Roman numeral).
'badly' is an anagram indicator.
'doing' with letters rearranged gives 'ndigo'.
'i'+'ndigo'='INDIGO'

'shows' acts as a link.

(Other definitions for indigo that I've seen before include "Adulthood" , "Spectral colour" , "Tropical plant" , "supplier of blue stuff" , "Ellington's Mood" .)

I've seen this clue in The Telegraph and The Sun.
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