Nude Bristolian covers junk (6)
I believe the answer is:
debris
'junk' is the definition.
(I know that junk can be written as debris)
'nude bristolian covers' is the wordplay.
'covers' says the answer is hidden in the clue (I've seen 'covering' mean this).
'DEBRIS' is hidden in the letters of 'nude bristolian'.
(Other definitions for debris that I've seen before include "Detritus, rubbish" , "Remains - wreckage" , "Brides with pieces of rubble" , "Rubble, detritus" , "Fragments of rubbish" .)