To be just, commonly halved (4)

I believe the answer is:

only

'to be just' is the definition.
(I've seen this before)

'commonly halved' is the wordplay.
'halved' suggests halving the letters.
'commonly' with half the letters taken is 'ONLY'.

(Other definitions for only that I've seen before include "See 6" , "Solely, lone" , "And nothing more; sole" , "Siblingless (child)" , "Unique; merely" .)

I've seen this clue in the Evening Standard.

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