Rocky, that old Spanish explorer (6)

I believe the answer is:

balboa

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This could be a double definition.

'rocky that old' is the first definition.
'Balboa' can be an answer for 'rocky' (Rocky Balboa from the Rocky films). I'm not certain of the rest of the definition.

'spanish explorer' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Another definition for balboa that I've seen is " Panamanian port named after Spanish explorer".)

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