Colour when the man's name is spoken (3)
I believe the answer is:
hue
'colour' is the definition.
(a hue is a colour or complexion)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hue that I've seen before include "red or black, say" , "Cast" , "Tone, shade" , "General hubbub - . . . and cry" , "Shade, aspect; Vietnam port" .)