Herald for one hundred and one entering the sea in France (10)

I believe the answer is:

proclaimer

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'herald' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I can't see?

'for one hundred and one entering the sea in france' is the wordplay.
'for' becomes 'pro' (as in being 'pro' or in favour of something).
'one hundred' becomes 'c' (Roman numeral).
'and' means one lot of letters go next to another.
'one entering' becomes 'lai' (I can't justify this - if you can you should give a lot more credence to this answer).
'the sea in france' becomes 'mer' ('sea' in French).
'pro'+'c'+'lai'+'mer'='PROCLAIMER'

Can you help me to learn more?

(Another definition for proclaimer that I've seen is " One declares".)

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