Reddish scorch mark on a uniform (6)
I believe the answer is:
auburn
'reddish' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?
'scorch mark on a uniform' is the wordplay.
'scorch mark' becomes 'burn' (mark from a fire).
'on' is a charade indicator (letters next to each other).
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'a'+'u'='au'
'burn' after 'au' is 'AUBURN'.
Can you help me to learn more?
(Other definitions for auburn that I've seen before include "Shade of brown" , "Of hair colour, reddish brown (6)" , "Golden" , "Red-brown hair colouring" , "Copper" .)