Jason's dog? (6,9)

I believe the answer is:

golden retriever

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'jason's dog?' is the definition.
'golden retriever' can be an answer for 'dog?' (golden retriever is a kind of dog). I am unsure of the 'jason's' bit.

'jason's dog?' is the wordplay.
'jason' becomes 'golden' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'dog?' becomes 'retriever' (eg a Golden Retriever).
'golden'+'retriever'='GOLDEN-RETRIEVER'

Can you help me to learn more?

(Other definitions for golden retriever that I've seen before include "Dog" , "canine" , "pet?" .)

I've seen this clue in The Guardian.

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