New house put up for Gallic commune (5)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

N for new, SEMI (house) reversed (put up). Nîmes is an interesting city of 150,000 or so, in Gard in the south of France, known as “the most Roman city outside of Italy” because of its extensive Roman remains. it’s only 24 miles from Avignon so you could visit both and dance “sur le pont“.