Wow! Acting studio films lavish finales (4)

I believe the answer is:

gosh

I'm a little stuck... Click here to teach me more about this clue!

'wow acting studio films lavish finales' is the definition.
I can't tell whether this definition defines the answer.

'acting studio films lavish finales' is the wordplay.
'finales' says to take the final letters (I've seen 'finale' mean this).
The last letters of 'acting studio films lavish' are 'GOSH'.

Can you help me to learn more?

(Other definitions for gosh that I've seen before include "Wow!" , "Crikey" , "My goodness!" , "Surprised expression" , "Well I never!" .)

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

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