Ground flour? Of course, no longer sure — it's faded (3-6)
I believe the answer is:
off-colour
'faded' is the definition.
Both the answer and definition are adjectives.
Maybe they are linked in a way I don't understand?
'ground flour? of course no longer sure' is the wordplay.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'no longer' is a deletion indicator.
'flour'+'of'+'course'='flourofcourse'
'flourofcourse' with 'sure' taken away is 'floofcour'.
'floofcour' is an anagram of 'OFF-COLOUR'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for off-colour that I've seen before include "Unwell, lacking pigment?" , "Slightly unwell" , "Informally unwell, looking pallid or somewhat indecent" , "Not well - looking pale" , "Not in the pink?" .)