Around (5)
'around' is the definition.
(circa means around or approximately)
This is all the clue.
(Other definitions for circa that I've seen before include "Preposition meaning about, usually preceding a date" , "Approximately (of a year)" , "Costa del Sol city" , "Approximately (Lat.)" , "More or less" .)
'around' is the definition.
(synonyms)
This is all the clue.
(Other definitions for about that I've seen before include "in the offing?" , "Regarding" , "In the area of or in relation to" , "Concerning; roughly" , "Concerning (something)" .)