Passed open ring all right (8)
I believe the answer is:
overtook
'passed' is the definition.
(I've seen this in another clue)
'open ring all right' is the wordplay.
'open' becomes 'overt' (synonyms).
'ring' becomes 'O' (letter resembling a ring).
'all right' becomes 'ok' (synonyms).
'overt'+'o'+'ok'='OVERTOOK'
(Other definitions for overtook that I've seen before include "having gone to right" , "Caught up with and passed" , "Caught up with and went past" , "Caught unprepared" .)