Crossword Genius

Secure her old plastic luggage container (3,6)

Ross

I believe the answer is:

bag holder

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

'secure her old plastic' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'luggage container' is the wordplay.
I cannot quite understand how this works, but
'luggage' could be 'bag' (bag is a kind of luggage) and 'bag' is found in the answer.
'container' could be 'holder' (I've seen this before) and 'holder' is located in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.
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