Ringo bashed six-footer in the dark (8)
I believe the answer is:
ignorant
'in the dark' is the definition.
(I've seen this before)
'ringo bashed six-footer' is the wordplay.
'bashed' indicates anagramming the letters.
'six footer' becomes 'ant' (an ant has six feet).
'ringo' anagrammed gives 'ignor'.
'ignor'+'ant'='IGNORANT'
(Other definitions for ignorant that I've seen before include "Poorly-educated" , "blissful?" , "Lacking information" , "No rating (anag) - in the dark" , "No rating for being uninformed" .)