Faded blue (3,6)
I believe the answer is:
off-colour
I believe this is a double definition.
'faded' is the first definition.
(faded in colour)
'blue' is the second definition.
(I've seen this before)
(Other definitions for off-colour that I've seen before include "Unwell -- risque" , "Informally unwell, looking pallid or somewhat indecent" , "Out of sorts" , "Unwell or mildly indecent" , "Slightly unwell" .)