Pointer dogs run around ring (6)
I believe the answer is:
cursor
'pointer' is the definition.
(I know that pointer can be written as cursor)
'dogs run around ring' is the wordplay.
'dogs' becomes 'curs' (cur can mean a violent dog).
'run' becomes 'r' (cricket abbreviation).
'around' indicates putting letters inside.
'ring' becomes 'O' (O is the shape of a ring).
'curs'+'r'='cursr'
'cursr' enclosing 'o' is 'CURSOR'.
(Other definitions for cursor that I've seen before include "Computer arrow" , "Place-marker on screen" , "Item on display" , "that may appear on computer screen" , "Computer screen marker" .)