Check artist's standing with the others (6)
I believe the answer is:
arrest
'check' is the definition.
(synonyms)
'artist's standing with the others' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'standing' is a reversal indicator (in a down clue, letters stand up).
'with' means one lot of letters go next to another.
'the others' becomes 'rest' (I've seen this in another clue).
'ra' reversed gives 'ar'.
'ar'+'rest'='ARREST'
(Other definitions for arrest that I've seen before include "Cause to stop" , "apprehend a law-breaker" , "Collar" , "Seize and take into custody" , "Stop - detain" .)