Unaware Ringo misused worker (8)
I believe the answer is:
ignorant
'unaware' is the definition.
(I've seen this in another clue)
'ringo misused worker' is the wordplay.
'misused' indicates anagramming the letters.
'worker' becomes 'ant' (worker is a type of ant).
'ringo' is an anagram of 'ignor'.
'ignor'+'ant'='IGNORANT'
(Other definitions for ignorant that I've seen before include "Empty-headed" , "Lacking in education" , "No rating (anag) - clueless" , "not read" , "Knowing nothing" .)