A touch of colour (5)

I believe the answer is:

shade

I believe this is a double definition.

'a touch' is the first definition.
(thesaurus)

'colour' is the second definition.
(shade is a kind of colour)

'of' acts as a link.

(Other definitions for shade that I've seen before include "Nuance" , "Colour; slight amount" , "Slight colour difference" , "Space sheltered from the sun" , "Partial or comparative darkness" .)

I've seen this clue in the Evening Standard.

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