Crossword Genius

Polish film in trouble (6)

Ross

I believe the answer is:

buffet

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

'trouble' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'polish film' is the wordplay.
'polish' becomes 'buff' (buffing is a kind of polishing).
'film' becomes 'ET' (E.T. the Extra-Terrestrial).
'buff'+'et'='BUFFET'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for buffet that I've seen before include "Help yourself table" , "Refreshment counter - slap" , "Box" , "place selling snacks" , "A self-help dining experience" .)

I've seen this clue in The Independent.
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