Run aground on a beach (6)
I believe the answer is:
strand
I believe this is a double definition.
'run aground' is the first definition.
(thesaurus)
'a beach' is the second definition.
(thesaurus)
'on' is the link.
(Other definitions for strand that I've seen before include "Beach; London road" , "Margin by a beach" , "Single piece of hair, rope etc" , "Beach or shore" , "Maroon - thread" .)