River spirit reflected sunlight (6)
I believe the answer is:
murray
'river' is the definition.
(I know that Murray is a river)
'spirit reflected sunlight' is the wordplay.
'spirit' becomes 'rum' (alcoholic spirit).
'reflected' says the letters should be written in reverse (letters reflected back).
'sunlight' becomes 'ray' (as in a ray of sunlight).
'rum' reversed gives 'mur'.
'mur'+'ray'='MURRAY'
(Other definitions for murray that I've seen before include "Sir James ---, first OED editor" , "Australian river" , "British hope" , "Australian flower" , "Andy --, tennis player" .)