Be close by old rocker, ignorant (9)
I believe the answer is:
benighted
'ignorant' is the definition.
(I've seen this before)
'be close by old rocker' is the wordplay.
'close by' becomes 'nigh' (I've seen this before).
'old rocker' becomes 'ted'.
'be'+'nigh'+'ted'='BENIGHTED'
(Other definitions for benighted that I've seen before include "Ignorant; caught in dark" , "Get behind (anag) - being ignorant" .)