Fear going round old vessel (4)

I believe the answer is:

argo

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

'old vessel' is the definition.
(I've seen this before)

'fear going round' is the wordplay.
'ARGO' is hidden in amongst the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for argo that I've seen before include "Fabulous ship" , "Agro about the constellation" , "Ship involved in the quest for the Golden Fleece" , "Old craft" , "Jason's craft" .)

I've seen this clue in The Mirror.

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