Leaving artist, having arrived, unseen (3,6)

I believe the answer is:

off camera

'unseen' is the definition.
(I've seen this in another clue)

'leaving artist having arrived' is the wordplay.
'leaving' becomes 'off' (as in 'I'm off').
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'having' indicates putting letters inside.
'arrived' becomes 'came' (come can mean to appear or arrive).
'off'+'ra'='offra'
'offra' enclosing 'came' is 'OFF CAMERA'.

I've seen this clue in The Daily Express.

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