Traveller has back-pack, old sport! (5,4)

I believe the answer is:

marco polo

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'traveller' is the definition.
(13th-century explorer)

'back-pack old sport' is the wordplay.
'back pack old' becomes 'marco' (I am not sure about this - if you are sure you should believe this answer much more).
'sport' becomes 'polo' (polo is a kind of sport).
'marco'+'polo'='MARCO POLO'

'has' is the link.

Can you help me to learn more?

(Other definitions for marco polo that I've seen before include "Traveller between 15 dn and 6 dn" , "13th-century Venetian traveller" , "European traveller" , "sheep" , "Adventurous traveller" .)

I've seen this clue in The Sun.

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