Battle site in France (5)

I believe the answer is:

somme

'battle site in france' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for somme that I've seen before include "French 2 down" , "First World War battlefield" , "Battle site in France" , "1916 battleground" , "French river, scene of 1916 battles" .)

I've seen this clue in The Telegraph.

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