Dress in black and appear older (7)
I believe the answer is:
bandage
'dress' is the definition.
(I know that bandage is a type of dress)
'black and appear older' is the wordplay.
I cannot quite see how this works, but
'black' could be 'b' (as in pencil classifications) and 'b' is found in the answer.
an anagram of 'and' is 'nda' which is present in the answer.
The remaining letters 'age' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for bandage that I've seen before include "Surgical dressing" , "Bind (a wound)" , "Wrapping for wound" , "Dressing for wounds" , "Cloth to cover injuries" .)