Crossword Genius

Store stocking books on fast-moving Australian action movie (5-2-2)

Ross

I believe the answer is:

shoot-em-up

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

'australian action movie' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'store stocking books on fast-moving' is the wordplay.
'store' becomes 'shop' (synonyms).
'stocking' means one lot of letters goes inside another ('stock' can mean 'carry' or 'contain').
'books' becomes 'OT' (abbreviation for Old Testament).
'on fast moving' becomes 'emu' (I am not sure about this - if you are sure you should believe this answer much more).
'ot'+'emu'='otemu'
'shop' enclosing 'otemu' is 'SHOOT-EM-UP'.

Can you help me to learn more?

I've seen this clue in The Independent.
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