Ruins partly inside Bristol (6)
I believe the answer is:
debris
'ruins' is the definition.
(thesaurus)
'partly inside bristol' is the wordplay.
'partly' indicates the answer is hidden within the clue.
'DEBRIS' is hidden in the letters of 'inside bristol'.
(Other definitions for debris that I've seen before include "Scattered wreckage" , "Rubble, lots of broken pieces" , "Brides with pieces of rubble" , "Rocky fragments" , "aftermath of wild reception?" .)