San Marino ready for manufacturing salt (8,6)

I believe the answer is:

ordinary seaman

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'manufacturing salt' is the definition.
The definition suggests a singular noun which matches the answer.

'san marino ready' is the wordplay.
'san marino ready' can be anagrammed to 'ORDINARY SEAMAN'.
However, I am unsure how this is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for ordinary seaman that I've seen before include "Lowest rank of Royal Navy sailor" , "OS in full" , "Crew member" .)

I've seen this clue in The Times.

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