Approximately half Circassian (5)

I believe the answer is:

circa

'approximately' is the definition.
(I've seen this before)

'half circassian' is the wordplay.
'half' suggests halving the letters.
'circassian' cut in half is 'CIRCA'.

(Other definitions for circa that I've seen before include "About (regarding dates)" , "About (a time)" , "Approximately (Lat.)" , "More or less" , "About, say, a date" .)

I've seen this clue in The Times.

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