Bright red mark from very minor injury? (7)

I believe the answer is:
scarlet
'bright red' is the definition.
(I've seen this in another clue)
'mark from very minor injury?' is the wordplay.
'mark' becomes 'scar' (mark left by an injury).
'from' means one lot of letters go next to another.
'very minor injury?' becomes 'let' (I am not sure about this - if you are sure you should believe this answer much more).
'scar'+'let'='SCARLET'
Can you help me to learn more?
(Other definitions for scarlet that I've seen before include "Clarets (anag.)" , "Fallen" , "Bright red of clarets" , "Murderer" , "Miss O'Hara appearing briefly" .)
