Crossword Genius

It sailed in far gone days (4)

Ross

I believe the answer is:

argo

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

'it sailed' is the definition.
The definition suggests a singular noun which matches the answer.

'in far gone days' is the wordplay.
'in' says the answer is hidden in the clue.
'ARGO' is hidden within 'far gone days'.

Can you help me to learn more?

(Other definitions for argo that I've seen before include "Old boat" , "Stars once recognised in the south" , "Mythological ship" , "Old sailing vessel" , "Agro about the constellation" .)

I've seen this clue in The Globe and Mail.
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