Crossword Genius

Big boxes containing very personal possessions? (6)

Ross

I believe the answer is:

trunks

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This might be a double definition.

'big boxes' is the first definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'very personal possessions?' is the second definition.
Although both the answer and definition are plural nouns, I cannot understand how one could define the other.

'containing' is the link.

Can you help me to learn more?

(Other definitions for trunks that I've seen before include "Swimming garments or tree stems" , "luggage" , "Men's swimsuits on an elephants?" , "Man's swimming costume" , "Men's swimsuit" .)

I've seen this clue in the Evening Standard.
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