Surest way to get a reddish brown colour (6)
I believe the answer is:
'colour' is the definition.
(I know that russet is a colour)
'surest way to get a reddish brown' is the wordplay.
'surest' becomes 's' (this might be a standard abbreviation of which I'm unaware).
'way' becomes 'e' (Compass direction - East).
'to get' indicates putting letters inside.
'a reddish brown' becomes 'rust' (I've seen this in another clue).
'se' inserted into 'rust' is 'RUSSET'.
Can you help me to learn more?
(Other definitions for russet that I've seen before include "Autumnal red as of leaves" , "Brown; apple variety" , "Reddish brown; apple" , "Autumnal reddish brown" , "Autumn red" .)