I've finished it but can anyone explain the clue to 13a? Obviously the direction (SE) + ring (O) +French wife (MME) gives us the answer SOMME but where does the banker come in? The nearest I can get is an obscure Australian word for a river in spate.
Thank you lector and kayakamina. I had, of course, scoured all accessible dictionaries in search of a definition of "banker" meaning "river", but could only find a definition that, in one sense, the word means an antipodean river full to the brim and on the point of overflowing, which doesn't really match the Somme! I think we'll have to take this as a loose interpretation of the definition by the crosswrd compiler - it wn't be the only one!