Crossword Genius

Non-speaker showing layer added (4,5)

Ross

I believe the answer is:

film extra

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'non-speaker' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'layer added' is the wordplay.
'layer' becomes 'film' (I have seen 'Thin layer' mean 'film' so perhaps 'layer' could also mean 'film').
'added' becomes 'extra' (similar in meaning).
'film'+'extra'='FILM EXTRA'

'showing' acts as a link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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