Keep display facilities containing foremost of sports bags (10)

I believe the answer is:

haversacks

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

'bags' is the definition.
(haversack is a kind of bag)

'keep display facilities containing foremost of sports' is the wordplay.
I cannot quite see how this works, but
'keep' could be 'have' (I've seen this in another clue) and 'have' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for haversacks that I've seen before include "bags" , "having these on their backs" .)

I've seen this clue in The Independent.

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