Running in a circle around others (9)
I believe the answer is:
arresting
'running in' is the definition.
(I've seen this before)
'a circle around others' is the wordplay.
'circle' becomes 'ring' (synonyms).
'around' indicates putting letters inside.
'others' becomes 'rest' (eg the rest of a group).
'ring' placed around 'rest' is 'rresting'.
'a'+'rresting'='ARRESTING'
(Other definitions for arresting that I've seen before include "remarkable" , "Running in" , "Very striking" , "spectacular" , "Police work" .)