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Fit most of the promos in a shiny metal container of genes (10)

Ross

I believe the answer is:

chromosome

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

'fit most of the promos' is the definition.
I can't tell whether this defines the answer.

'in a shiny metal container of genes' is the wordplay.
'in' indicates putting letters inside.
'a shiny metal' becomes 'chrome' (I've seen this before).
'container of genes' becomes 'omos' (I can't justify this - if you can you should give a lot more credence to this answer).
'chrome' going around 'omos' is 'CHROMOSOME'.

Can you help me to learn more?

(Other definitions for chromosome that I've seen before include "Genetic structure" , "Gene carrier" , "structure in cell" , "Structure carrying genes" , "this could be X or Y" .)

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