Painting evidently involves a touch of colour (5)
I believe the answer is:
tinge
'colour' is the definition.
(tinge is a kind of colour)
'painting evidently involves' is the wordplay.
'involves' says the answer is hidden in the clue.
'TINGE' can be found hidden inside 'painting evidently'.
'a touch of' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for tinge that I've seen before include "Slight tint" , "Suffuse" , "Touch (of colour?)" , "Little bit of colour" , "Slight amount of colour" .)