Watched picture on tape (4)

I believe the answer is:

seen

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

'picture on tape' is the wordplay.
'picture' becomes 'see' (synonyms).
'on tape' becomes 'n' (I can't explain this - if you can you should believe this answer much more).
'see'+'n'='SEEN'

Can you help me to learn more?

(Other definitions for seen that I've seen before include "Witnessed" , "Perceived by sight" , "Noticed" , "Viewed" , "Met - understood" .)

I've seen this clue in the Sydney Morning Herald.

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