Ringo roused six-footer in the dark (8)
I believe the answer is:
ignorant
'in the dark' is the definition.
(I've seen this before)
'ringo roused six-footer' is the wordplay.
'roused' indicates an anagram (I've seen this in other clues).
'six footer' becomes 'ant' (an ant has six feet).
'ringo' with letters rearranged gives 'ignor'.
'ignor'+'ant'='IGNORANT'
(Other definitions for ignorant that I've seen before include "Lacking information" , "Discourteous" , "Ill-educated" , "No rating (anag) - in the dark" , "Lacking in or good manners" .)