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It's terrible for a French agricultural worker in the old days around Louis the First? (10)

Ross

I believe the answer is:

unpleasant

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

'it's terrible' is the definition.
(thesaurus)

'a french agricultural worker in the old days around louis the first?' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
'first?' could be 'a' and 'a' is located in the answer.
This explanation may well be incorrect...

'for' is the link.

Can you help me to learn more?

(Other definitions for unpleasant that I've seen before include "Disagreeable" , "Troublesome" , "Objectionable" , "like Mrs Warren's Profession?" , "Obnoxious" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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