Crossword Genius

Thus madame is seen in one of her rivers? (5)

Ross

I believe the answer is:

somme

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

'seen in one of her rivers?' is the definition.
I can't judge whether this defines the answer.

'thus madame' is the wordplay.
'thus' becomes 'so' (synonyms).
'madame' becomes 'mme' (abbreviation).
'so'+'mme'='SOMME'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for somme that I've seen before include "1916 battleground" , "Scene of WW One battles" , "World War One battle region" , "First World War battlefield" , "Scene of World War One battles" .)

I've seen this clue in The Times.
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