Subtle shade’s no good in neckwear (5)
I believe the answer is:
tinge
'subtle shade's' is the definition.
(I've seen this in another clue)
'no good in neckwear' is the wordplay.
'no good' becomes 'ng' (abbreviation).
'in' indicates putting letters inside.
'neckwear' becomes 'tie' (type of neckwear).
'ng' placed inside 'tie' is 'TINGE'.
(Other definitions for tinge that I've seen before include "Small quantity of (differing) colour" , "Slight colouring" , "Hint of colour" , "show a bit of colour ?" , "A suspicion" .)